Diversity and seasonal incidence of insect pests of mango (Mangifera indica L.) in gangetic basin of West Bengal

An experiment was carried out on seasonal occurance of insect pests of mango and their diversity at gangetic basin of West Bengal where 12 insects belonging to 12 genus under order hemiptera, thysanoptera, coleoptera, hymenoptera and lepidoptera were found causing damage to the crop. Mango hopper, Idioscopus clypealis (Lethierry), Amritodus atkinsoni Lethierry; thrips; red banded caterpillar, Deanolis sublimbalis (Snellen) and fruit fly, Bactrocera dorsalis (Hendel) and Bactrocera zonata (Saunders) were recorded to cause direct yield losses while leaf cutting weevil Deporaus marginatus (Pascoe) and leaf webber, Orthaga exvinacea (Hampson) were found causing post harvest crop damage. Maximum population of mango hopper and thrips were noticed from 1^st standard week to 12^th standard week when the plant started to initiate panicle. The mango red banded caterpillar remained very active from 12^th to 17^th standard week while fruit fly species viz. Bactrocera dorsalis and B. zonata damage was noticed from 21^st SW to 33^rd then incidence declined. The other insects showed minor importance to this region. The abiotic parameters like temperature, relative humidity, rainfall, sunshine hours, wind speed showed significant relationship with the pests.