Assessment of novel insecticides against the insect pests of cucumbe
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Date
2010
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MPUAT, Udaipur
Abstract
During September to December 2008, a field trial was conducted to study the
seasonal incidence of major insect pests of cucumber along with bioefficacy of some
novel insecticides against the pests at Horticulture Farm, Rajasthan College of
Agriculture, Udaipur.
The results of present investigation revealed that the incidence of jassid,
Amrasca biguttula biguttula (Ishida) and whitefly, Bemisia tabaci (Gennadius)
commenced during 38th SMW (17th – 23rd September), whereas, red pumpkin beetle,
Raphidopalpa foveicollis (Lucas) during 37th SMW (10th - 16th September). The
population of jassid and whitefly touched the peak during 8th - 14th October (86.30
jassids/five plants) and 15th – 21st October (67.35 whiteflies/five plants), respectively.
While, the peak incidence of red pumpkin beetle (4.00 beetles/five plants) was
observed during 22nd – 28th October. The fruit fly, Dacus cucurbitae (Coquillet)
infestation was recorded soon after fruit formation i.e. second week of October (3.03
%) and reached the maximum level (17.04 %) during the first week of November. The
population of jassid, whitefly, red pumpkin beetle and fruit fly were found non
significantly associated with average temperature and relative humidity.
Bioeffecacy of different insecticides viz., imidacloprid 70 WG (24 and 21g
a.i./ha), imidacloprid 200 SL (25 and 20 g a.i./ha), acetamiprid 20 SP (20 g a.i./ha)
and thiamethoxam 25 WG (25 g a.i./ha) was evaluated against the major insect pests
of cucumber. Among these, imidacloprid 200 SL @ 25 g a.i./ha was found most
effective for the control of jassids and whiteflies as it accounted 74.40 and 69.18 per
cent control, respectively. Likewise, the least fruit infestation on the number and
weight basis (11.17 and 10.78%) was recorded in this treatment over control (21.01%). Acetamiprid 20 SP @ 20 g a.i. /ha was found most effective treatment to
control red pumpkin beetle as it caused 47.92 per cent reduction in beetle population.
All the insecticidal treatments investigated were found effective in controlling pests
and did not produce any phytotoxic effect on cucumber plants.
The effects of different insecticides were also observed on the population of
natural enemies. Highest reduction was observed in acetamiprid 20 SP @ 20 g a.i./ha
(26.18%) treatment, whereas, the imidacloprid at various doses proved to be safer for
natural enemies.
Description
Assessment of novel insecticides against the insect pests of cucumbe
Keywords
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Citation
Purohit and Rana, 2010