1 edition of Spotted alfalfa aphid found in the catalog.
Written in English
Issued June 1956.
|The Physical Object|
Spotted aphids – clover or alfalfa? In Australia, Therioaphis trifolli refers to two genetically distinct, host specific aphids, the spotted alfalfa aphid and spotted clover aphid. Therioaphis trifolli is a distinct looking aphid species. Pale yellow-green in colour and about 2 mm long as adults, they have 4 to 6 rows of tiny black spots. Pea aphid and spotted alfalfa aphid are the most prevalent species in the High Plains. Spotted alfalfa aphid has been found damaging dryland alfalfa. Identification (life cycle and seasonal history) Pea and blue aphids are quite similar in appearance but pea aphid is yellow-green in color while the blue alfalfa aphid is bluish-green, although.
Abstract. Survival and reproduction of the spotted alfalfa aphid, Therioaphis maculata (Buckton), were similar to those of the pea aphid, Macrosiphum pisi (Harris), at all combinations of three temperatures and three humidities in studies using three alfalfa clones differing in resistance to both aphids. Differences among clones and among temperatures in Cited by: Alfalfa Insect Management – Spotted Alfalfa Aphid – K-State Research and Extension - June Description: Spotted alfalfa aphids are pale yellow-green in color with conspicuous rows of black spots on their backs. Each spot is tipped with a short spine. The winged form has smokey-colored areas along the wing veins.
spottedalfalfaaphidsonsubsequentspringgrowthof l(4) #,ontrolofspotted alfalfa aphidandpea. California Agriculture - Archive. Many insecticides will kill the spotted alfalfa aphid—Therioaphis maculata (Buckton)—but even the most effective chemicals provide only a temporary relief from aphid attack. In most infested areas chemical control of the aphid is .
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The spotted alfalfa aphid is a small, pale yellow or grayish aphid with four to six rows of spined black spots on its back. Mature females may either be wingless or have wings with smoky areas along the veins.
This aphid prefers warm weather and is generally found during summer months. The spotted alfalfa aphid is found throughout the United States and is occasionally found in Iowa alfalfa. The spotted alfalfa aphid is smaller than most aphids in alfalfa, reaching one-eighth inches in length.
This aphid is also distinguished because it is pale yellow with dark spots covering Spotted alfalfa aphid book abdomen. Unlike the pea aphid or blue alfalfa. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle.
Spotted alfalfa aphid definition is - a highly destructive Old World aphid (Therioaphis maculata) that is established in the U.S. in warmer areas and causes yellowing and stunting of.
Damage: Spotted alfalfa aphids prefer to feed on alfalfa, although they will infest some clovers. These aphids inject a toxic salivary secretion into the plants, which causes yellowing at the feeding site and along the veins of the leaf.
The location of the spotted alfalfa aphid on the plant is greatly influenced by the relative humidity. Integrated control of the spotted alfalfa aphid has been achieved in California.
Economic thresholds were established so that insecticides are applied only when damage is imminent. Native predators, introduced parasites, and entomogenous fungi now keep the spotted-alfalfa-aphid populations below the economic threshold for most of the year.
Spotted alfalfa aphid book The spotted alfalfa aphid is smaller than pea aphid, reaching 1/8 inches in length. This aphid is also distinguished because it is pale yellow with dark spots covering the abdomen. Unlike the pea aphid or blue alfalfa aphid, the spotted alfalfa aphid can successfully reproduce in warm temperatures (> 90˚F).
Several other insects also prey on these pests. Species of wasps, specific parasites of the spotted alfalfa aphid, have been imported from the insect's native home and are now becoming established in the United States. Whether some of our native parasitic insects will attack this pest remains to be seen.
Pea aphid and blue alfalfa aphid are similar looking, both green in color (except for the pink pea aphid biotype), and are a problem primarily in the spring.
Spotted alfalfa aphid is a yellow, hot-weather aphid and is a problem only on a few cultivars. Aphids in alfalfa have many natural enemies. Also see the key to aphids common to alfalfa. Alfalfa (/ æ l ˈ f æ l f ə /), also called lucerne and called Medicago sativa in binomial nomenclature, is a perennial flowering plant in the legume family is cultivated as an important forage crop in many countries around the world.
It is used for grazing, hay, and silage, as well as a green manure and cover name alfalfa is used in North : Tracheophytes. Development and performance of Cody alfalfa, a spotted alfalfa aphid resistant variety. Manhattan, Kan.: Agricultural Experiment Station, Kansas State University of Agriculture and Applied Science, (OCoLC) Material Type: Government publication, State or province government publication: Document Type: Book: All Authors.
Spotted alfalfa aphid Therioaphis trifolii click for html version Other common names: Spotted clover aphid Summary: The spotted alfalfa aphid is a widespread pest in Australia. The aphids are average sized, yellow-green coloured and distinguished from other aphids by the distinctive rows of tiny spots on their back.
The spotted alfalfa aphid, Therioaphis maculata, is found throughout the United States and Mexico and is occasionally found in Utah alfalfa (Fig. 13). The spotted alfalfa aphid is smaller than most aphids in alfalfa, reaching ⅛″ in length.
This aphid is also distinguished because it is pale yellow with dark spots covering the abdomen. to insect pests, including the spotted alfalfa aphid and pea aphid, has been incorporated into some vari - eties, and they are recommended. Varietal resistance to the alfalfa weevil has not been achieved; however, a few varieties are tolerant to low levels of weevil infestations.
Increased insect resistance will likelyFile Size: KB. Includes. Alfalfa aphid (Macrosiphum creelii). Blue alfalfa aphid (Acyrthosiphon kondoi).
Pea aphid (Acyrthosiphon pisum). Spotted alfalfa aphid (Therioaphis maculata). Pest description and crop damage Aphids are common on legumes. Aphids can frequently cause problems when their natural enemies are eliminated by sprays targeting alfalfa weevil.
the integration of chemical & biological control of the spotted alfalfa aphid:the illustrated control concept, etc. [stern, al] on *free* shipping on qualifying offers. the integration of chemical & biological control of the spotted alfalfa aphid:the illustrated control concept, : al Stern.
Includes. Alfalfa aphid (Macrosiphum creelii) Blue alfalfa aphid (Acyrthosiphon kondoi) Pea aphid (Acyrthosiphon pisum) Spotted alfalfa aphid (Therioaphis maculata). Pest description and crop damage Pea and alfalfa aphids are the common light-green aphids found on stems in the upper canopy.
Aphids feed on plant sap. Large numbers can stress and yellow alfalfa. alfalfa blossoms to drop and punctured seeds may fail to germinate. Photo Credits: Pea aphid, spotted alfalfa aphid, and cowpea aphid photos used with permission from University of California Statewide IPM Program, J. Clark, photographer Extension is a Division of the Institute of Agriculture and Natural Resources at theFile Size: KB.
resistance is long lasting. Moapa alfalfa was free of aphid problems for 10 years before a biotype was able to reproduce on the cultivar. Biology and Ecology of the Spotted Alfalfa Aphid The spotted alfalfa aphid is a highly fecunditive species, reproduces by partheno.
When alfalfa is more than half grown (stem lengths 10—15 inches long), the plant can tolerate 40 or more aphids per stem with little yield loss. Spotted Alfalfa Aphid. The spotted alfalfa aphid (Therioaphis maculata Buckton) is a small, rapidly moving, pale yellow to gray aphid. It has four to six conspicuous rows of dark spots with small.
Pea, cowpea, and blue alfalfa aphid feed in the new growth, at the tips and young leaves, while spotted alfalfa aphid feeds on older leaves. As leaves die, the aphids move higher into the plant; heavily damaged plants may become entirely defoliated except for a .JOURNAL OF INVERTEBRATE PATHOL () Bioassay of Entomophthora against the Spotted Alfalfa Aphid Therioaphis trifolii f.
maculata R. J. MILNER' CSIRO, Division of Entomology, Armidale, New South Wales,Australia AND R. S. SOPER USDA, Insect Pathology Research Unit, Boyce Thompson Research Institute at Cornell, Ithaca, New York Cited by: Field performance of alfalfa selected for resistance to spotted alfalfa aphid has conformed closely with expected results based on greenhouse evaluations.
BIOTYPES Several biotypes of spotted alfalfa aphid are known to exist in the Southwest, and performance of resistant cultivars may vary depending upon the biotype(s) present.