Management of Maize Stem Borer, Chilo partellus (Swinhoe) Infesting Maize (ZeaimaysiL.)
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Date
2021
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Publisher
MPUT Udaipur
Abstract
The investigation on “Management of Maize stem borer, Chilo partellus
(Swinhoe) Infesting maize, (Zea mays L.)” was conducted on Agronomy Farm and
Department of Entomology, Rajasthan College of Agriculture, MPUAT, Udaipur during
Kharif 2018with the objectives to seasonal incidence of insect pests of maize and their
correlations with the environmental factors and efficacy of bio pesticides against maize
stem borer.
During the crop season in Kharif 2018, the maximum leaf injury (8.30 mean LIR)
by C. partellus was recorded in the second week of August at 30th days after sowing. The
dead heart incidence first appeared during last week of July and reached to its peak (3.00
per cent) during second week of August at 30th days after sowing. The peak infestation
(96.50 /plant) of Rhopalosiphum maidis was observed in the second week of August. The
maximum population of Myllocerus discolour (5.50 /plant) was noticed during third week
of August. The incidence of Helicoverpa armigera larvae began in third week of July and
reached to its peak (3.30/plant) in the first week of August. The H. armigera larvae
population showed a significant negative correlation with mean relative humidity
(-0.764). Natural enemies viz., coccinellids and green lacewing reached to its peak
respectively, 7.50/plant and 2.50/ plant in the second week of August. The coccinellids
beetles (0.914) and green lacewing (0.938) population showed a significant positive
correlation with R. maidis population.
During crop season, the effect of six dates of sowing viz., 30th July, 6th August,
13th August, 20th August, 27th August and 3rd September, 2018 was observed on the basis
of seasonal mean the maximum larval population was recorded in the second date of
sowing (6th August), while minimum larval was found in the last date of sowing (3rd
September) in both varieties.
All the bio-pesticides were significantly superior over untreated check at 30 days
after infestation; the minimum leaf injury rating of 2.20 was recorded in plot treated with spinosad 35 % @ 0.3 ml/l, which was significantly superior over the other treatments. All
the treatments were found significantly superior as compared to untreated control. The
lowest per cent dead hearts (10.00) was recorded with the treatment of with spinosad 35%
@ 0.3 ml/l, which was significantly superior over the other treatments. Highest net profit
(Rs. 27497.52 /ha) and B: C ratio (22.87) was also recorded in the treatment of spinosad
Description
Management of Maize Stem Borer, Chilo partellus (Swinhoe) Infesting Maize (ZeaimaysiL.)
Keywords
Citation
Singh G. And Mahla M.K.