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Studies on bollworm complex of cotton and their management

KrishiKosh

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Title Studies on bollworm complex of cotton and their management
 
Creator B. K, Shivanna
 
Contributor N. G, Kumar
 
Subject cotton, planting, diseases, animal developmental stages, yields, genotypes, insecticides, sowing, inorganic acid salts, crops
 
Description Investigations on bollworm complex of cotton and their management were carried
out at Zonal Agricultural Research Station, Navile, Shimoga, during 2007-2009. Studies
on population dynamics of bollworms through pheromone traps comprises pink bollworm
(31.46%), american bollworm (29.50%), spiny bollworm (21.00%) and spotted bollworm
(18.01%) in hierarchy with peak collections in 6 - 9th, 23rd and 38 - 46th standard weeks.
Early sowing of (April to June month) DCH - 32 cotton exhibited minimum larval
population, (squares and bolls), square and green boll damage, shed fruiting bodies with
maximum yield and yield attributing parameters compared to July and August sown
crop.
Screening genotypes against bollworms indicated that the hirsutum (Abadhita and
Sahana) and arboreum (AK - 235 and DLSa - 17) varieties suffered less from bollworms
larval population (squares and bolls), square and green boll damage, shed fruiting bodies
with maximum yield and yield attributing parameters than herbaceum and hybrids.
Foliar application of thiodicarb, spinosad, novaluron and indoxacarb alone at 60
dyas after sowing with an interval of 15 days resulted in less larval population (squares
and bolls), square and green boll damage, shed fruiting bodies with maximum yield and
yield attributing parameters than botanicals (NSKE 5%) / microbial (Bt) or alternated
sprays with synthetic or microbial groups or botanicals. However, botanicals, microbial
and their derivatives recorded higher population of predators viz., Coccinellids,
chrysopids and syrphids than any other treatments. Significantly maximum seed cotton
yield was recorded in spinosad (2123.06 kg/ha) followed by thiodicarb (2012.77 Kg/ha),
emamectin benzoate (1453.52 Kg/ha), novaluron (1908.82 Kg/ha) and indoxacarb alone
(1891.58 Kg/ha) than untreated control (475.00 Kg/ha). The highest B/C ratio was
recorded in thiodicarb (1:10.05), alternated spray application of lamba cyhalothrin 5 EC –
endosulfan 35 EC – chlorpyriphos 20 EC – thiodicarb 75 WP – thiodicarb 75 (1:9.83) and
endosulfan (1:8.22). Interestingly additional yield over control was high in spinosad
(1148.06 Kg/ha) where the cost of additional treatment (Rs.14716.79) was also high in
this treatment.
 
Date 2016-05-26T09:53:20Z
2016-05-26T09:53:20Z
2011-11-18
 
Type Thesis
 
Identifier Th-9885
http://krishikosh.egranth.ac.in/handle/1/66320
 
Language en
 
Format application/pdf
 
Publisher University of Agricultural Sciences, Bengaluru