Effect of time and frequency of insecticide spraying on the control of mango leafhoppers (Idioscopus spp.).
Islam M. S., Elegio D. T.
Author Affiliation: Department of Horticulture, Institute of Postgraduate Studies in Agriculture (IPSA), Salna, Gazipur 1703, Bangladesh.
Bangladesh Journal of Entomology 7 : 93-99
Abstract : An experiment was carried out to determine a suitable and effective spray programme (using deltamethrin) for controlling mango leafhoppers (Idioscopus spp.) in the Philippines from November 1994 to June 1995. Ten treatment combinations of six sprays at different times of flower bud development and fruit setting stage were selected. The leafhopper population was below the economic injury level of 4.45 adults/panicle prior to the half panicle emergence stage but drastically increased thereafter when large numbers of nymphs appeared. The population was highest in trees sprayed only once or twice terminating on the 14th day after flower bud break, while the lowest population was observed in trees sprayed 4-6 times up to the post full bloom stage. This was the trend when the population increased continuously, attaining a peak of more than 300 nymphs/panicle prior to the full bloom stage. Thereafter the population of leafhoppers significantly declined.