Results 181 to 190 of about 4,947 (219)

Genetics of resistance to Aphis craccivora in cowpea

Euphytica, 1996
Inheritance of aphid resistance and allelic relationships among sources of resistance was studied in the parents, F1, F2, F3, and backcross populations of cowpea crosses. Each 4-day old seedling was infested with five fourthinstar aphids. Seedling reaction was recorded 14–16 days after infestation when the susceptible check was killed.
Githiri, S. M, Ampong-Nyarko, K, Osir, E. O, Kimani, P. M   +3 more
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Resistance in lima bean to Aphis craccivora (Hemiptera: Aphididae)

Phytoparasitica, 2019
The cowpea aphid (Aphis craccivora) can be an important pest on lima bean (Phaseolus lunatus L.). The objective of this work was to evaluate the effect of different genotypes of lima bean on the biology of A. craccivora and to identify possible sources of resistance to aphids under laboratory conditions. Two trials were set up, an antibiosis and a free-
Luiz Carlos de Melo Júnior, Paulo Roberto Ramalho Silva, Antonio Vieira Gomes Neto, Silvino Intra Moreira, Mayara Fernandes dos Santos, Solange Maria de França   +5 more
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Aphis (Aphis) craccivora Koch 1854

Published as part of Abdullaev, Ikram, Khusanov, Alijon, Voronova-Bartet, Nina, Abdullayeva, Maxbuba, Gandjaeva, Lola, Jumanazarov, Xasanbay, Kholmatov, Bakhtiyor, Rahimov, Matnazar, Matyakubov, Zafar, Iskandarov, Abdulla, Ruzmetov, Rasul, Ollaberganova, Mavluda, Joraev, Muhammadyusuf & Doschanova, Manzura, 2024, Annotated Checklist of the Aphids ...
Abdullaev, Ikram, Khusanov, Alijon, Voronova-Bartet, Nina, Abdullayeva, Maxbuba, Gandjaeva, Lola, Jumanazarov, Xasanbay, Kholmatov, Bakhtiyor, Rahimov, Matnazar, Matyakubov, Zafar, Iskandarov, Abdulla, Ruzmetov, Rasul, Ollaberganova, Mavluda, Joraev, Muhammadyusuf, Doschanova, Manzura   +13 more
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Spread of Groundnut Rosette Virus by Aphis craccivora (Koch)

Nature, 1964
IT has been known for many years1 that close spacing of groundnuts, Arachis hypogaea L., reduces the incidence of groundnut rosette in a crop. Storey and Ryland2 pointed out that there was a reduction in the number of rosette virus-infected plants per unit area of land, as well as the reduction in percentage infection that would be expected with larger
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Aphis craccivora . [Distribution map].

Distribution Maps of Plant Pests, 2005
Abstract A new distribution map is provided for Aphis craccivora Koch ( A. medicaginis auctt. nec Koch) (Hem., Aphididae) (Black legume aphid). Host Plants: Groundnut, many other legumes, Capsicum, Citrus .A vector of Black Locust Mosaic disease.
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Varietal Resistance of Cowpea to Cowpea Aphid, Aphis Craccivora Koch.

International Journal of Tropical Insect Science, 1992
As part of an extensive and systematic programme to find genetic sources of resistance to Aphis craccivora, a major pest of cowpea, Vigna unguiculata, a total of 181 accessions from the germpiasm collection at the International Institute of Tropical Agriculture were screened in glasshouse tests using a simple visual damage scale. Twenty-four accessions
A. K. Ansari, H. F. Van Emden, S. R. Singh   +2 more
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Aphis craccivora Koch 1854

10. Aphis craccivora Koch, 1854 Host plants Amaranthus viridis L. (Amaranthaceae), Coriandrum sativum L. (Apiaceae), Bidens biternata (Lour.) Merr. & Sherff, Conyza canadensis (L.) Cronquist, Dendranthema indicum (L.) Des Moul., Parthenium hysterophorus L., Sonchus asper (L.) Hill (Asteraceae), Chenopodium album L. (Chenopodiaceae), Arachis hypogaea L.,
Hassan, Muhammad Asghar, Asif, Muhammad, Chakrabarti, Samiran, Amin, Muhammad, Abbas, Zohair, Maryam, Zershina, Iqbal, Zafar, Ali, Muhammad, Qasim, Muhammad, Bashir, Nawaz Haider, Ali, Muhammad Yasir, Xing, Jichun   +11 more
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Effects of pyriproxyfen on development and hormone of the aphis, Aphis craccivora (Hemiptera: Aphididae)

Journal of Economic Entomology
Abstract Pyriproxyfen (PPF) has been shown to affect the pupal stage and ecdysone levels in holometabolous insects, such as silkworms and mealworms. It remains unknown whether it affects hemimetabolous insects with their hormone levels in insects lacking a pupal stage. In this laboratory study, bioassays were conducted to investigate the
Haolin Li, Wenjie Zhang, Yongheng Zhang, Xiaxia Guo, Jiangan Hou, Honghong Li, Jiguang Wei, Xuesheng Li   +7 more
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RESISTANCE TO APHIS CRACCIVORA (HOMOPTERA:APHIDIDAE) IN SELECTED VARIETIES OF COWPEA

Journal of Entomological Science, 1985
Nearly 200 varieties of cowpea, Vigna unguiculata (L.) Walp, were screened for resistance to the cowpea aphid, Aphis craccivora Koch. Three varieties known to be resistant in West Africa were highly susceptible to an aphid population from the southern United States.
Joyce L. Barmore, J. A. A. Renwick, Frank J. Messina   +2 more
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Precocene II-Induced Effects in the Aphid Aphis Craccivora Koch.

International Journal of Tropical Insect Science, 1989
Adult (2–20 hr old) viviparous Aphis Craccivora were treated with 0.5 to 4.0 jig of precocene II. Treatment led to dose-related reduction in the progeny number, survival and life span of the aphid, but wing development was not affected. With 2.0 (μg/aphid or more of precocene II, all surviving offsprings shared precocious metamorphosis, but even with 0.
U. S. Srivastava, A. K. Jaiswal
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