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Systematics and Nymphal Characteristics of Black Bean Aphid, Aphis Craccivora Koch (Homoptera: Aphididae)

Mamta Trivedi and Rajendra Singh
Department of Zoology, DDU Gorakhpur University, Gorakhpur 273 009, Uttar Pradesh
Abstract—Aphis craccivora Koch 1854 is one of the major pest of legume crops worldwide. It can be distinguished by other species by the following characters: first segment of hind tarsus always with two hairs; dorsum of abdomen blackish, usually completely sclerotic, having a pale area around the siphunculi and with a dark continuous median patch with polygonal reticulations; 8th abdominal tergite with only 2 hairs; siphunculi blackish, cylindrical, strongly imbricated; cauda elongate, somewhat pointed apically with 5-7 hairs. Both morphs (apterous as well as alate) of A. craccivora were re-described providing detailed morphometry of their different parts of the body on different food plants. In the present study help of morphometry was taken to identify the instars of A. craccivora reared on seedlings of food plants to a known instar and taken from non clonal populations. Each instar was described and illustrated. The number of antennal segments, length of hindtibia, siphunculi and number of caudal hairs are found to be useful characters for identifiying I and II instar of apterous and alatoid morphs while ratios of length of siphunculi and cauda to ht2 are helpful in identifying apterous III and IV instars. Apterous adults can be distinguished by nymphal instars by having one primary rhinarium on antennal segment IV and developed cauda. Size of wingpads and whether it overlaps each other or not separate the alate III and IV instars. A key was prepared to separate each instar of both morphs with high precision. 

Index Terms—taxonomy, biosystematics, instar identification, synonymy, aphid

Cite: Mamta Trivedi and Rajendra Singh, "Systematics and Nymphal Characteristics of Black Bean Aphid, Aphis Craccivora Koch (Homoptera: Aphididae)," International Journal of Life Sciences Biotechnology and Pharma Research, Vol. 3, No. 1, pp. 205-224, January 2014.
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