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Researcher Panwar, D. V. Singh
Advisor Kumar, Ashok
Source KrishiKosh-Indian National Agricultural Research System
Content type Text
Educational Degree Master of Science (M.Sc.)
Publisher MPUAT
File Format PDF
Language English
Subject Domain (in DDC) Technology ♦ Agriculture & related technologies ♦ Animal husbandry
Subject Keyword Some ♦ Newer Insecticides ♦ Insect ♦ Pests ♦ Cotton ♦ Seasonal Incidence ♦ Evaluation of Some Newer Insecticides Against Major Insect Pests of Cotton Together With Their Seasonal Incidence ♦ Agronomy
Abstract Field trials were conducted to find out the seasonal incidence of major insect pests of cotton along with evaluation of some newer insecticide against the pest during kharif 2003 at Rajasthan College of Agriculture, Udaipur. The investigation revealed that the incidence of jassid [Amrasca biguttula biguttula (Ishida)], aphid (Aphis gossypii Glover) and thrips (Thrips tabaci Lindermann) commenced during mid August whereas white fly (Bemisia tabaci Gennadius) during first week of September. The population of jassids and white flies touched the peak (111.0 jassids/5plants and 89.17 white flies/5 plants) during 17th to 23rd September whereas aphids and thrips reached the peak level during 24th – 30th September (190.17 aphids/5plants) and 1st – 7th October (99.33 thrips/5 plants) respectively. The bollworms infestation on bolls reached the maximum level (20.18%) during last week of November. The population of jassid and thrips were found significantly associated with average temperature and bollworms infestation on bolls were significantly associated with average temperature and relative humidity. Different doses of indoxacarb @ 300, 150, 75 and 50 gm a.i./ha, avaunt @ 75 gm a.i./ha, lambda-cyhalothrin @ 100, 50, 25 and 15 gm a.i./ha karate 25 gm a.i./ha were evaluated against the major insect pests of cotton and cypermethrin @ 75 gm a.i./ha, chlorpyrifos @ 500 gm a.i./ha and quinalphos @ 500 gm a.i./ha were used as standard checks. Indoxacarb @ 300 gm a.i./ha gave maximum control of sucking pests as well as bollworms which was statistically at par with the results obtained with 150 and 75 gm a.i./ha while lambda-cyhalothrin @ 100 gm a.i./ha gave moderate control of sucking insect pests and bollworms of cotton and was statistically at par with the results obtained with 50 and 25 gm a.i./ha. Indoxacarb and lambda-cyhalothrin at all the doses investigated did not produce any phytotoxic effect on cotton plants. The efficacy of different insecticidal treatments on predators viz., Chrysoperla sp. and coccinelids revealed that indoxacarb and lambda-cyhalothrin were safe while chlorpyrifos and quinalphos were comparatively toxic. It is thus, concluded that indoxacarb @ 75 gm a.i./ha was found optimum and safest dose, which performed better in effective and economic control while lambdacyhalothrin @ 25 gm a.i./ha was found optimum and safest dose which performed moderately and economically in controlling sucking insect pests and bollworms infestation of cotton.
Educational Use Research
Education Level UG and PG
Learning Resource Type Thesis
Publisher Place Udaipur
Size (in Bytes) 356.11 kB
Page Count 88