Studies on seasonal incidence and management of Litchi Fruit Borer, Conopomorpha sinensis Bradley (Gracillariidae: Lepidoptera) in the low hills of Himachal Pradesh
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Date
2022-11-09
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College of Horticulture and Forestry Neri, Hamirpur (H.P.)
Abstract
The present investigation entitled “Studies on seasonal incidence and
management of Litchi Fruit Borer, Conopomorpha sinensis Bradley
(Gracillariidae: Lepidoptera) in the low hills of Himachal Pradesh” was carried out
during 2021-22 in different litchi growing areas of four district (Kangra, Hamirpur,
Bilaspur and Mandi ) in the low hills of Himachal Pradesh to record prevalence of
litchi fruit borer. During the survey maximum infestation of borer was found at
Nagrota Bagwan in district Kangra. Study on seasonal incidence was carried out at
RHR&TS, Jachh and LMRS Nagrota Bagwan. During the study, litchi fruit borer
infestation was evident from March to July. It was observed that infestation of
Conopomorpha sinensis was severe during June and July months as compared to other
months of observation. All weather factors recorded in present investigation had
significant as well as non-significant impact on the activity of borer. The bio-efficacy
study in both the modules proved that the synthetic insecticides viz., lambda
cyhalothrin, chlorantraniliprole and cypermethrin performed relatively better as
compared to flubendamide and imidacloprid in the decreasing order whereas the biopesticides
were found to be least effective of all the synthetic insecticides included in
the study. The insecticides viz., lambda cyhalothrin, chlorantraniliprole and
cypermethrin were able to avoid yield loss due to fruit borer to a considerable extent
and the values for the parameter varied between 83.00 and 58.72 per cent in these three
most effective chemicals compared to bio-pesticides in single spray module where the
values were found to lie between 84.19 and 67.50 in the two modules for both
concentrations used in the study. The BCR values for these insecticides were recorded
to be very high (130.76:1, 100.47:1 and 50.06:1 ) as against < 1.0- 20.69:1 calculated
for the three bio-pesticides included in the study.