COMPATIBILITY OF VARIOUS INSECTICIDES AND FUNGICIDES AGAINST PESTS OF CABBAGE
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Date
2013
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ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD
Abstract
The present studies were carried out in the laboratory and greenhouse of the
Department of Entomology and Students Farm, College of Agriculture, Rajendranagar
during kharif and rabi, 2012-13 with an objective to evaluate physical compatibility,
phytotoxic incompatibility and chemical compatibility of pesticide combinations against
pests of cabbage.
(The physical compatibility of 6 insecticides viz., spinosad, indoxacarb, cartap
hydrochloride, chlorfenapyr, flubendiamide, Bacillus thuringiensis and 2 fungicides viz.,
copper oxychloride and metalaxyl MZ and one bactericide, streptocycline were evaluated
with jar compatibility test). Out of 18 combinations of insecticides and fungicides/
bactericide, spinosad + copper oxychloride, cartap hydrochloride + copper oxychloride,
spinosad + metalaxyl MZ and spinosad + streptocycline showed 10ml, 10ml, 10ml and
15ml of foaming, respectively and Bacillus thuringiensis + streptocycline showed 5ml of
sedimentation. This foaming/sedimentation was lower than the prescribed limit (2ml/100ml
or 20ml/l). The remaining 13 pesticide combinations showed neither foaming nor
sedimentation indicating that all the 18 pesticide combinations were physically compatible.
The phytotoxic incompatibility due to combination of insecticides and fungicides/
bactericide on cabbage showed no phytotoxic symptoms such as injury to the leaf tip,
yellowing, wilting, necrosis, vein clearing, epinasty and hyponasty on the leaves.
The chemical compatibility of insecticide and fungicide/bactericide combination
against cabbage leaf webber, Crocidolomia binotalis, cabbage aphid, Brevicoryne brassicae
and the leaf spot, Alternaria brassicae under field conditions showed that all the 18
combinations reduced the incidence of leaf webber upto 5 DAS during both kharif and rabi
seasons. The toxicity of spinosad + copper oxychloride increased with time upto 5 DAS
and was on par with flubendiamide + copper oxychloride the later being relatively superior
upto 2 DAS. The insecticides flubendiamide and spinosad in combination with all the
fungicides/bactericide viz., copper oxychloride, metalaxyl MZ and streptocycline were
highly effective in controlling the leaf webber population. Also the mixture of cartap
hydrochloride + copper oxychloride was effective in controlling leaf webber in cabbage.
Similarly, the aphid incidence reduced upto 5 DAS in all the combinations during
both kharif and rabi seasons and subsequently increased. Spinosad in combination with all
the fungicides/bactericide viz., copper oxychloride, metalaxyl MZ and streptocycline were
highly effective in reducing the population of aphids during both the seasons.
The per cent disease incidence (PDI) of Alternaria leaf spot reduced upto 5 DAS
and thereafter slowly increased indicating that all the combination sprays were effective
upto 5 DAS. Similar trend was noticed in per cent severity of disease also. Among the
various insecticide and fungicide/bactericide combinations indoxacarb + metalaxyl MZ and
cartap hydrochloride + metalaxyl MZ were highly effective in reducing the PDI and
severity (%) of A. brassicae
Spinosad + metalaxyl MZ was most effective compared to other two spinosad
combinations against cabbage leaf webber and aphids and also recorded highest yield. It
was the next best combination after indoxacarb + metalaxyl MZ and cartap hydrochloride +
metalaxyl MZ against A. brassicae. Cartap hydrochloride + copper oxychloride was
effective combination against leaf webber and was the 4th best combination against aphids
and A. brassicae and recorded >70% reduction over control and also recorded best yield.
Hence, spinosad + metalaxyl MZ and cartap hydrochloride + copper oxychloride
combinations could be recommended when there is the incidence of leaf webber, aphids
and A. brassicae.
Flubendiamide in combination with fungicides/bactericide viz., copper oxychloride,
metalaxyl MZ and streptocycline was effective against leaf webber. Flubendiamide +
metalxyl was the 5th best combination against A. brassicae and recorded > 70% reduction
over control. Cartap hydrochloride + metalaxyl MZ was most effective combination against
A. brassicae and recorded > 75% reduction of leaf webber. Indoxacarb + metalaxyl MZ
was the first best combination against A. brassicae and recorded > 80% reduction of leaf
webber over control. Hence Flubendiamide + metalxyl, cartap hydrochloride + metalaxyl
MZ and indoxacarb + metalaxyl MZ combinations could be recommended as they are
effective against both leaf webber and A. brassicae.
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Keywords
COMPATIBILITY, VARIOUS, INSECTICIDES, FUNGICIDES, AGAINST, PESTS , CABBAGE