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1. The Aphid Life Cycle
- www.backyardnature.net
- The Aphid Life Cycle.
- When considering the life cycle of an aphid, for instance, we can't avoid focusing on its curious reproduction strategies and the kinds of host plants it lives on during different stages of its life. ...
- Obviously these critters can endure some cold weather! The largest aphid in the picture is only about 1/16th of an inch long (2 mm).
- The drawing at the left gives a better idea of what a wingless aphid looks like. ...
- As is so often the case with any type of insect, there are many kinds of aphid. ... There are Woolly and Gall-making Aphids in the family Eriosomatidae, Pine and Spruce Aphids in the family Chermidae, Phylloxeran Aphids in the family Phylloxeridae, and our Turnip Aphids are "typical" aphids in the Aphid Family, the Aphididae.
- Each of the many aphid species has its own life cycle, but there are some features uniting nearly all of them. ... A newly born aphid becomes a reproducing adult within about a week and then can produce up to 5 offspring per day for up to 30 days! The French naturalist Reaumur during the late eighteenth century calculated that if all the descendants of a single aphid survived during the summer and were arranged into a French military formation, four abreast, their line would extend for 27,950 miles, which exceeds the circumference of the earth at the equator! .
- An even more amazing feature of life cycles of most aphid species is that reproduction is accomplished without the help of male aphids! In the picture above you can see that some aphids are much smaller than the others. ...
- An "average" aphid life cycle would be something like this:.
- In spring an egg hatches, producing a wingless female aphid who soon begins parthenogenetically producing new wingless females. ... At the right you see what a winged aphid may look like, though they come in many colors and shapes. This new generation of female winged aphid very well may at this time find a plant host of a completely different species from that on which their spring generations have developed. ...
- Typically late in the year when it's time to move back to the plant species on which the aphid overwinters, finally some aphids develop into males as well as females. ...
2. MANAGEMENT OF THE WOOLLY APHID IN SUGARCANE
- www.icar.org.in
- WOOLLY APHID IN SUGARCANE .
- Incidence of Woolly aphid in India and other countries:.
- The occurrence of sugarcane woolly aphid, Ceratovacuna lanigera (Zehntner) has been recently noticed to cause damage in sugarcane crop. The woolly aphid was recorded earlier on sugarcane from North-Eastern States like Nagaland, Assam, Tripura, Sikkim and also from West Bengal and even from Uttar Pradesh but there was no infestation on sugarcane crop. ... Sugarcane woolly aphid is also known as main pest of sugarcane in tropical Asian region i. ... Sugarcane is a primary host of this aphid while bamboo, Miscanthus sinensis and Cynodon dactylon are the secondary hosts. ...
- Nature of injury, losses, life cycle of woolly aphid The nymphs and adults of sugarcane woolly aphid congregate on the central surface of leaves along midrib and desap resulting in drying up of leaves besides excreting honey dew on the upper surface of the lower leaves on which fungus develops quickly resulting in 'sooty mould' showing complete blackening of leaves, Sooty mould affect photosynthesis, resulting quality and quantity. ... The winged female of wooly aphid can fly with wind to a distance of 1. ... The life cycle of this aphid is completed in a period of one month depending on the climatic conditions and sugarcane varieties.
- MANAGEMENT OF THE WOOLLY APHID IN SUGARCANE .
- Utilise sugarcane varieties less susceptible to the woolly aphid. ...
- In summer treat the epicenters of woolly aphid infestation with dichlorvos to prevent further population build up. ...
- Regular surveillance and monitoring of sugarcane woolly aphid for timely forewarning and adoption of BIPM measures. ...
- Set up Dipha aphidivora and Micromus igorotus nurseries under shade nets and augment their population in woolly aphid - infested areas by periodic releases especially during June - July. ...
- The pesticides endosulfan , malathion , chlorpyriphos, acephate, methyl demeton, dichlorvos, phorate or carbofuron, dimethoate and metasystox have been recommended for the management of the sugarcane woolly aphid by different agencies (Central Team headed by the Agricultural Commissioner, GOI; VSI, Pune; UAS, Dharwad; TNAU, Coimbatore; SBI, Coimbatore and ZARS, Mandya - UAS, Bangalore ). ...
- Prompt harvesting of cane should be ensured to reduce the development of woolly aphid population. ...
3. Wooly Ash Aphid
- www.countyofsb.org
- Woolly Ash Aphid.
- The Woolly Ash Aphid, Prociphilus franxinifolii, is one of the most troublesome insects found on Modesto ash, Fraxinus velutina. ...
- Modesto ash is a common host of this aphid.
- Injury: Aphid feeding distorts the new spring growth, causing curled and cupped leaves that remain affixed at the ends of twigs. ...
- Description: An adult woolly ash aphid is approximately 2. ... Glands, located on the head, and in three longitudinal rows on the abdomen, exude a wax that gives the aphid it's woolly appearance. ...
- Life Cycle: The woolly ash aphid overwinters on ash. ... When these suckers are pruned away, the remaining aphid population may be so small as to be rarely noticed, but if the main outer branches are pruned severely in such a way as to encourage rapid, extensive sucker growth in the canopy, the pest problem may become severe.
- Controls: Natural predators such as green lacewing and syrphid fly larvae feed on this aphid, however, augmented releases may be necessary in spring to achieve better control. ...
- Insecticidal soap, horticultural oils and Merit have been recommended for use against the aphid. ... Consider adding a wetting agent to foliar applications, to assist in penetrating the aphid's waxy defense. ...
4. Aphids
- www.ext.vt.edu
- The white pine aphid feeds on the bark of twigs and branches of Eastern white pine. Heavy aphid infestations can seriously weaken small trees.
- Aphid colonies may be found on young leaves, new succulent shoots, and twigs or branches. ... This species is the green apple aphid.
- Aphid feeding often causes leaves to curl and become deformed. ...
- Black and brown fungi, appropriately called sooty molds, cover leaves and other objects below aphid colonies where honeydew collects. ... A variety of insecticides are registered for aphid control.
- While not particularly injurious to either of its hosts, this aphid can become a nuisance because its white, woolly threads accumulate under heavily infested trees.
- This insect is commonly called the Hemlock Woolly Aphid even though it is not in the scientific family of true aphids. ...
- The pine bark adelgid is also commonly called an aphid. ...
- The same insecticides which are registered for aphid control may be used on adelgids; however, the results are not always satisfactory because their protective waxy coat reduces the amount of insecticide which reaches the insect.
5. CPB: Aphid Project homepage
- www.cpb.bio.ic.ac.uk
- THE APHID PROJECT .
- This page gives an overview of completed and ongoing projects on the aphid system. ...
- A fully quantitative aphid-natural enemy food web study, which has been conducted in Silwood Park since 1994 and is now led by Frank van Veen, provides us with excellent background data on the importance of parasitoids and fungal pathogens in the field. The work on the pea aphid system concentrates on evolutionary aspects of the plant-aphid-natural enemy interaction and has recently started to take into account accessory bacteria that live in the aphid body.
- The pea aphid system provides a fantastic opportunity to study the evolution of resistance in a broader ecological context. ... We are also interested in how accessory bacteria influence the interaction between aphid and parasitoid.
- We tested this measuring the resistance of 30 pea aphid clones to the parasitoids Aphidius ervi, A. ... There was significant variation among aphid clones in resistance to all three natural enemy species and in fecundity. ... There were no significant correlations between resistance to any natural enemy and aphid fecundity. ...
- Here, we study the consequences of being attacked by a parasitoid in resistant and susceptible pea aphid clones.
- We take two approaches to explore links between accessory bacteria and ecologically important aphid traits. Firstly, we study correlations between the presence of specific accessory bacteria and aphid life-history traits. ... We therefore, secondly, also experimentally manipulate the bacterial community of single pea aphid clones to separate the effect of aphid genotype and bacterium. ...
- Clonal variation and covariation in aphid resistance to parasitoids and a pathogen. ...
- The pea aphid system.
- Full list of references of the Drosophila and aphid group .
6. Alfalfa Aphid
- alfalfa.okstate.edu
- Although aphid infestations can occur at nearly any time of the year in Oklahoma, damaging populations are most common from February to May during growth of the first alfalfa crop. Two species usually found during this time each year are the pea aphid and blue alfalfa aphid. The pea aphid is the largest of the species found in alfalfa, and is typically light-green in color. ... Preferred feeding sites are similar to those of the pea aphid, except that the most common biotype of the blue aphid in Oklahoma (designated BAOK90) may be found in greatest numbers on lower portions of stems. ...
- A third species, the spotted alfalfa aphid, may infest alfalfa fields during February and March, but the occurrence of damaging populations in winter is relatively infrequent (5-10 year intervals). ... Size of this species is relatively small in comparison to the pea aphid or blue aphid. ... An additional species that typically occurs in low numbers during late winter and spring is the cowpea aphid. ... The cowpea aphid prefers to feed on leaves near plant terminals and on stems. ...
- Of the four species found in alfalfa, the symptoms observed with infestation by the cowpea aphid have been the least severe. ... It is important to note, nonetheless, that seasonal occurrence of the cowpea aphid has changed radically in recent years, with high population densities occurring during summer months. ...
- In the presence of high population densities, feeding by the pea aphid typically results in stunting of plant growth and chlorosis of leaves. ... From the time it was first collected in Oklahoma in 1977 until 1990, the extent of damage by the blue alfalfa aphid was similar to that of the pea aphid. ... There were few reports of stand reductions due to blue aphid infestation. ...
- Until 1990 and the identification of blue aphid biotype BAOK90, the spotted alfalfa aphid clearly had the greatest damage potential of any insect pest in alfalfa. ... An unusual damage symptom often caused by the spotted aphid is clearing of veins of newly-formed leaves near plant terminals called "veinbanding". ... The spotted aphid is a serious threat to newly planted stands because its seasonal abundance is greatest from August to October when alfalfa is planted. ...
7. News from the College of Agricultural & Life Sciences
- www.cals.wisc.edu
- RESEARCHERS ARE BEGINNING TO UNDERSTAND NEW APHID.
- When the soybean aphid first appeared in the United States in 2000, Wisconsin farmers saw what it could do. ...
- But last summer the aphid was back, packing just as big a punch.
- Now that the aphid is here to stay, growers need information on the pest, which is native to China. A team of researchers from the College of Agricultural and Life Sciences is building a picture of how the aphid operates in Wisconsin. The researchers want to know what other crops the aphid feeds on, when it colonizes fields, and what growers can do to manage aphid/virus damage.
- "We're starting to learn what to expect from the aphid/virus complex and to identify steps growers can take," says plant pathologist Craig Grau. ...
- Entomology graduate assistant Robb Alleman reported that the soybean aphid can feed and reproduce on several kinds of clover in the laboratory and on red clover in the field. It also will feed on snap beans, which is causing problems for growers because the aphid transmits viruses to snap beans. Alleman found that the aphid fed very little on alfalfa and not at all on peas.
- Researchers say that the aphid population can then spread across an entire field within two weeks. ...
- Theyre studying the aphid's major predator, the multi-colored Asian lady beetle. ...
- Insecticide sprays can decimate aphid populations, according to Wedberg and his coworkers. However, aphid populations rebounded within two weeks, often rising to numbers that exceeded pre-spray levels. Even though aphid populations increased after spraying, there was a yield gain of 8. ...
- The CALS researchers found that planting soybeans early before May 10 played a key role in minimizing aphid-related losses. ...
8. Soybean Aphid May Be Back Next Year
- www.ag.ohio-state.edu
- Soybean Aphid May Be Back Next Year .
- WOOSTER, Ohio The soybean aphid, which was practically nonexistent in soybean fields this growing season, may be back with a vengeance next year. ...
- The aphid seems to be following a pattern of high populations one year, low populations the next, said Hammond, with the Ohio Agricultural Research and Development Center. How this is working is that the multicolored Asian ladybeetle seems to be tied to the aphid. In years when aphid populations are high, the aphids provide a good food source for the ladybeetles. This cuts down aphid populations for the next year. But since populations are low this year, ladybeetles are not as predatory and this gives aphid populations a chance to increase for the next year. ...
- The soybean aphid, which can greatly reduce yields in soybean fields with its voracious appetite, has been in Ohio for four years with high populations in 2001, low populations in 2002, high populations again in 2003, and a practical no-show this year. Hammond said that field research in Illinois is already indicating aphid populations may be high in 2005. ...
- Hammond said that if the aphid population patterns continue, researchers would take the next step into looking at ways of keeping the insect under control during high population years. ...
- The thing we fear the most is that the aphid is going to biologically change and find new hosts to overwinter on, said Hammond. The soybean aphid is parthenogenic, meaning that it can reproduce without the fertilization process. Because of this ability, the soybean aphid might have the capability of developing new biotypes (individuals that are like the parent but can adapt to suit their survival needs). ...
9. APHID MANAGEMENT
- insects.tamu.edu
- APHID MANAGEMENT .
- The green peach aphid, Myzus persicae, has an extremely wide host range of over 100 plants including a wide variety of vegetable and ornamental crops (Baker 1982). Most aphid species are relatively host-plant specific, although they may occasionally be found colonizing certain plants or 'reserve hosts' with which they are normally not associated. ...
- in length although the largest aphid in northeastern America, the giant bark aphid (Logistigma caryae) is 6 mm. ...
- On the back of the fifth abdominal segment, a pair of tube-like structures called 'siphunculi' or 'cornicles' are present on most aphid species. ... The shape, size and hairs (setae) associated with these structures are important characters for aphid species identification. ...
- Generalized aphid life cycle. ... Under greenhouse conditions the cotton aphid may complete a maximum of 51 generations a year, with each adult producing about 85 young. ... Parthenogenic green peach aphid females, Myzus persicae, can produce three to six fully formed young per day for several weeks (Johnson & Lyon 1988). ...
- In some cases, eggs and males of aphid species are unknown. ...
- As aphid populations develop, infestation sites become littered with cast skins. ...
- Many aphid species secrete a sticky substance called 'honeydew' which is similar to sugar water. ... ) even harvest and overwinter the eggs of the corn root aphid, Aphids maidiradicis (Borror et al. ...
- The cotton aphid is known to transmit over 50 plant viruses and the green peach aphid, over 100 (Kennedy et al. ...
- Suppression tactics for managing aphid infestations. Most aphid populations are moderated by natural controls that include environmental stresses (high winds, heavy rains, extreme temperatures, etc. ... However, any aphid may be considered a potential pest when conditions are favorable for reproduction. ...
10. Small Grains XII - Russian Wheat Aphid
- highplainsipm.org
- Russian Wheat Aphid.
- Russian Wheat Aphid.
- Two forms of Russian wheat aphid (RWA) are found in the High Plains during the year: a wingless female and a winged female (See Aphids in Small Grains, Colorado State University Cooperative Extension Service in Action 5. 568, for more information on telling Russian wheat aphid apart from other aphids that attack small grains in the region). It is difficult to determine if an individual aphid will be winged or wingless until it is near maturity. ...
- Aphid feeding prevents young leaves from unrolling. ...
- In 2003, a new biotype of the Russian wheat aphid was observed. ... It is not known what the distribution of the new biotype will be, but currently it is assumed that it will occur wherever the original aphid was found. The original aphid is still the most common of the two types, so resistant varieties still have some value and are still recommend in areas with consistent Russian wheat aphid problems.
- Although resistant varieties provide the most effective RWA control, several other practices can provide additional control of the aphid. ...
- Chemical control of Russian wheat aphid will probably not be necessary on resistant wheat varieties, but may still be necessary on susceptible types and on barley. ...
- Treatment guidelines for Russian wheat aphid by crop stage. ...
- For more details, see Sampling Russian Wheat Aphid on the Western High Plains. ...
- Product list for Russian Wheat Aphid:.
- Note: If greenbugs are present and you are in a sorghum production area, be certain that the Russian wheat aphid population has exceeded the recommended economic threshold before making an insecticide application. ...
- Categories: Small grains, Insects, Mites, Russian wheat aphid, Cereal aphids.
11. Aphid Alert 2003
- ipmworld.umn.edu
- Aphid Alert : a research/outreach program providing region-wide virus vector surveillance for the Northern Great Plains potato industry.
- Aphid Alert 2003.
- Aphid Alert 2003, No. ...
- 2003 Results: Index to archive of 2003 Aphid Alert newsletters.
- 2002 Results: Index to archive of 2002 Aphid Alert newsletters.
- 2001 Results: Index to archive of 2001 Aphid Alert newsletters.
- 2000 Results: Index to archive of 2000 Aphid Alert newsletters.
- 1999 Results: Index to archive of 1999 Aphid Alert newsletters.
- 1998 Results: Index to archive of 1998 Aphid Alert newsletters.
- More aphid biology and pictures of species colonizing potato.
- How potato fungicides impact green peach aphid.
- EXAMINE, European consortium of scientists involved in the collection of national data on aphid distribution, phenology and abundance.
- (aphid suction trapping) .
12. UC IPM: UC Management Guidelines for Russian Wheat Aphid on Small Grains
- axp.ipm.ucdavis.edu
- Russian Wheat Aphid.
- Following its introduction into California, Russian wheat aphid spread rapidly throughout the entire state, causing serious injury and crop loss. In recent years, however, Russian wheat aphid populations have declined significantly throughout the Central Valley and the Intermountain region. ... The high desert (Antelope Valley), however, appears to remain a hot spot for Russian wheat aphid, which can be found there almost every year. ... In most areas of California, it appears that Russian wheat aphid builds to damaging levels sporadically every few years, much like the population cycles of bird cherry-oat aphid. ...
- The Russian wheat aphid is a small pale green insect with an elongated, spindle-shaped body that may be covered with a powdery coating of wax. ... Russian wheat aphid survives the summer on a variety of grasses and migrates to cereals in late fall as summer hosts die. ...
- Russian wheat aphid does not attack corn, sorghum, or rice. While feeding, Russian wheat aphid injects a toxin into the plant. ...
- Russian wheat aphid is not a vector of barley yellow dwarf virus. ...
- No current commercial small grain varieties have resistance to Russian wheat aphid. Researchers have identified several sources of resistance to Russian wheat aphid and efforts are underway to incorporate this resistance into commercial varieties. ...
- Russian wheat aphid is attacked by several predators and parasites commonly associated with other aphid pests of small grains. Efforts should be made to conserve these natural enemies as they are of great importance in controlling other cereal aphids and may reduce Russian wheat aphid populations as well. ...
- Destroy and remove volunteer cereals to help reduce or delay the buildup of Russian wheat aphid populations. Plants stressed for water or nutrients are more susceptible to and suffer greater damage from Russian wheat aphid, so maintain adequate soil moisture and fertilization. ...
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