Population Fluctuations of Aphids in Relation to Virus Disease Incidence in Egyptian Faba Bean Fields
Population Fluctuations of Aphids in Relation to Virus Disease Incidence in Egyptian Faba Bean Fields
Mohga M. El-Tahlawey, A. Mandour and AE Aboulata
ABSTRACT
Infection induced by both Faba bean necrotic virus (FBNYV) and mosaic causing viruses were inspected during Oct. 2003 to Apr. 2004 on Faba bean fields grown in Qalyubia governorate. Population density of seven different aphid species on faba bean was arranged descendingly as follow: Aphis craccivora (270.9). Myzus persicae. (89.0). A fabae (52.5). Acyrthosiphon pisum (24.3), A. gossypii (4.7). A sesbaniea (1.8). and A. nerii (0.7). Population fluctuation of previous aphid species was also recorded on Faba bean during the same period at the same fields. Fluctuations of Infection rate for both virus-infection types (necrotic yellowing and mosaic) are the same. It starts with a low rate and then increasing during season period and then declined at the end. It consists of four infection sub-cycles, i.e., two small ones in the middle and two big more ones at the beginning and at the end of the period. Fluctuations of infection rate for both infection types were matched with the population fluctuations of aphid vectors. Infection curve studies and infection rate matching with aphid population fluctuations could help in getting integrated disease management (IDM) strategic manipulation during the growing season.
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