STUDY THE BIOLOGY OF RICE WEEVIL (Sitophilus oryzae L.) AND ITS INCIDENCE IN DIFFERENT VARIETIES OF STORED WHEAT
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Date
2019
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Birsa Agricultural University, Ranchi
Abstract
The investigation on the biology of rice weevil on BG-3 variety and its incidence
in different variety of wheat were carried out at PG Laboratory of the Department of
Agricultural Entomology, of Birsa Agricultural University, Kanke, Ranchi, Jharkhand
from first week of March, 2018 to first fortnight of September, 2018.
The results to study the biology of Rice weevil S. oryzae (L.) on BG-3 wheat.
The incubation period in BG-3 variety ranged from 4 to 6 days with total average 4.85
days respectively. Adult male survived with out food for only 4 to 6 days with mean of
5.20 days respectively. The adult longevity of female without food ranged from 8 to 11
days with mean 6.70 days respectively. The adult longevity of male with food were
ranged from 65 to 73 days with the average of 67.50 days. The adult longevity of female
with food was ranged from 110 to 113 days with mean 111.5 days respectively. Preoviposition
period was recorded 3.5 to 5 days with the total average of 4.25 days. The
oviposition period ranged from 38 to 50 days with the average of 43.12 days
respectively. The post oviposition period was recorded on BG-3 variety of wheat was
ranged from 24 to 27 days with average of 25.25 days respectively. The fecundity of
mated female ranged from 65 to 91 days with average of 75.05 days on during total life
cycle. The total life cycle with food ranged on BG-3 wheat from 99 to 108 days with
total average 102.50 days respectively.
The Egg hatchability of rice weevil egg laying by 5 female ranged from 16 to 18
eggs with total eggs were 85 during 5 days egg hatched ranged from 10 to 13 with total
58 egg hatched, unhatched egg ranged from 5 to 6 with the total unhatched eggs was 27
eggs and hatchability percentage of eggs was ranged from 62.5 to 72.22 percent with
total percentage was 68.14 percent.
Highest main developmental period was recorded on variety of BG-3
(37.62) days. The maximum number of adult emergence was recorded in DBW- 14
showing 15.66 adult. The highest grain damage was recorded in DBW-14 (53.33%)
Lowest grain damage of 38.25 per cent was recorded in K-2733 closely followed by BG-
3. The maximum per cent loss in grain weight was recorded in DBW-14(21.80%) and
the lowest per cent loss in grain weight was recorded in BG-3 (14.38%).
Description
STUDY THE BIOLOGY OF RICE WEEVIL (Sitophilus oryzae L.) AND
ITS INCIDENCE IN DIFFERENT VARIETIES OF STORED WHEAT