Present Scenario of Insect Pests of Soybean in Mewar-Vagar Region of Rajasthan and Their Management
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Date
2007
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MPUAT, Udaipur
Abstract
ABSTRACT
Investigations on “Present scenario of insect pests of soybean in Mewar-Vagar region of Rajasthan and their management” was carried out at Agronomy Farm, Rajasthan Collage of Agriculture, Udaipur and Agricultural Research Station, Banswara during kharif, 2004 and 2005.
During survey forty two species of insect pests were found associated with soybean crop from Mewar-Vagar region. Among them the major insect pests causing significant damage were tobacco caterpillar, Spodoptera litura (Fab.); girdle beetle, Oberia brevis (Swed.); green semilooper, Chrysodeixis acuta (Walk.); jassids, Amrasca spp. and green clover worm, Plathypena scabra (Fab.). Tobacco caterpillar, girdle beetle, green semilooper and jassids were more havoc in Banswara and Pratapgarh region.
Varieties MAUS-81 and Pratap Soya were most preferred by jassids and tobacco caterpillar while Bragg was least preferred by tobacco caterpillar and JS-71-05 was least preferred by jassids. Variety Indra Soya-9 was less preferred by green semilooper whereas, Indra soya-9 and Pratap soya were less preferred by girdle.
The infestation of insect pests significantly affected the plant height, number of pods per plant, grains per plant, weight of hundred seeds and grain yield per plot. Total 24.41 to 31.64 per cent yield loss was observed in varieties JS-335 and Pratap Soya at Udaipur and Banswara.
Indoxacarb 100 g a.i./ha was found most effective for the control of tobacco caterpillar, green semilooper and girdle beetle followed by lambda-cyhalothrin 40 g a.i./ha and triazophos 40 EC 300 g a.i./ha. Acetamiprid was found effective against sucking pest jassids.
* Research Scholar, Deptt. of Agril. zoology & Entomology, RCA, MPUAT, Udaipur.
** Assoc. Prof. & Head, Deptt. of Agril. zoology & Entomology, RCA, MPUAT, Udaipur.
The residual toxicity of insecticides on soybean leaves, based on PT and LT50 values, was longest for indoxacarb (100 g a.i./ha) followed triazophos 40 EC (300 g a.i./ha) and these were persisted upto nineteen days after spray. Shortest residual toxicity was observed for acetamiprid (40 g a.i./ha).
None of the insecticidal treatments produce any phytotoxic symptoms on the soybean plants. Indoxacarb and lambda-cyhalothrin had phytotonic effect on plants increasing the plant height, number of trifoliate leaves, length of tap root, number of pods per plant and number of grains per plant. Indoxacarb was found safe to natural enemies of soybean pests whereas lambda-cyhalothrin was highly toxic.
Maximum net profit was recorded in triazophos 40 EC (300 g a.i./ha) with cost benefit ratio of 1.0 :7.79 and 1.0 :11.03 at Udaipur and Banswara, respectively.
Description
Present Scenario of Insect Pests of Soybean in Mewar-Vagar Region of Rajasthan and Their Management
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Citation
Kumawat and Kumar, 2007