Determination of relevant critical stages for the management of the mango hopper, Idioscopus clypealis Lethierry.
Verghese A., Rao G. S. P.
Author Affiliation: Cent. Inst. Hort. for Northern Plains, Lucknow 226?006, India.
Indian Journal of Horticulture 44 : 280-283
Abstract : Critical infestation stages of the cicadellid Idioscopus clypealis were determined on mangoes in Uttar Pradesh, India, in 1983-84. The mean density of cicadellids was 0.54-20.64/panicle in 1983 and 0-6.03/panicle in 1984. In both years, the peak population occurred when the fruit was pea size. At the post-bloom stage a population of 2 adults/panicle was sufficient to cause yield reduction. It is suggested that the critical infestation stages are at post-bloom, when the fruit is marble size and one month before harvest, with corresponding critical population levels of 2 adults, 6-21 nymphs and 4-11 hoppers/panicle.