INFLUENCE OF PHYSICAL FORM OF HOST GRAIN ON GROWTH AND DEVELOPMENT OF RUSTY GRAIN BEETLE, Cryptolestes ferrugineus (Stephens) AND ITS MANAGEMENT WITH INSECTICIDES
Loading...
Files
Date
2018
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Acharya N.G. Ranga Agricultural University
Abstract
The present investigation on “Influence of physical form of host grain
on growth and development of rusty grain beetle, Cryptolestes ferrugineus
(Stephens) and its management with insecticides” was conducted in the
laboratory, Department of Entomology, Agriculture college, Bapatla, Guntur
district, Andhra Pradesh during 2017-18.
Sorghum brokens was found to be the most suitable host for
C. ferrugineus with minimum development period (44.40 days), maximum
growth index (1.33), the highest number of adults of C. ferrugineus (418.20),
the highest per cent adult emergence (70.80) and higher weight loss (11.50%).
The highest development period of C. ferrugineus was found to be 60.60
days on wheat brokens while it was minimum in sorghum brokens (44.4 days).
The moisture per cent was 11.88, 11.02, 12.74 and 10.43 on brokens grains of
sorghum, wheat, maize and rice. The maximum moisture content was recorded
on maize brokens (12.74) and minimum on sorghum flour (8.31). The damage
due to the development of C. ferrugineus was 2.97, 4.13, 4.56 and 5.84 per cent
on sorghum, rice, maize and wheat whole grains, respectively.
Machilipatnam population of C. ferrugineus was 34.66 and 21.35 folds
resistant at LC50 level and 4.14 and 9.89 folds resistant at LC99.9 level to malathion
and deltamethrin, respectively in comparison with susceptible Rajahmundry
population. Similarly, Bapatla population of C. ferrugineus was 16.66 and 1.75 folds
resistant at LC50 level to malathion and deltamethrin, respectively and at LC99.9 it was
1.92 and 2.57 folds resistant.
Among the new insecticides tested for the management of insecticide
resistant Machilipatnam population of C. ferrugineus, chlorfenapyr was found to
be the best at LC99.9 level with the highest relative toxicity (9.84 and 4.26 times)
than malathion and deltamethrin followed by emamectin benzoate (4.84 and
2.09 times). Emamectin benzoate and spinosad were effective at LC50 level (13.68;
11.23 and 4.14; 3.40 times) compared to malathion and delamethrin. Lufenuron
expressed lowest relative toxicity at LC50 and LC99.9 level (1.04 and 0.69 times)
to malathion and (0.85 and 0.29 times) to deltamethrin.
Description
D5632
Keywords
null