Alternative use of insecticide and Bacillus thuringiensis for controlling diamondback moth, Plutella xylostella (Linnaeus) on cabbage
2003
Somsak Siriphontangmun(Department of Agriculture, Bangkok (Thailand). Plant Protection Research and Development Office. Entomology and Zoology Group)
Alternative use of insecticide and Bacillus thuringiensis (Bt) for controlling diamondback moth, Plutella xylostella (Linnaeus) on cabbage, was conducted in farmer field at Thamuang district, Kanchanaburi province during January-March 2002 in trial 1 and during June-August 2003 in trial 2. The experimental design was randomized complete block with 10 treatments and 3 replications. The treatments were applied, abamectin, chiorfenapyr, fipronil, spinosad, abamectin alternate with Bt (abamectin/Bt.), chlorfenapyr/Bt, fipronil/Bt, spinosad/Bt and indoxacarb at the rates of 60 ml, 40 ml, 60 ml, 20 ml, 60 ml/80 g , 40 ml:80 g, 60 ml/80 g, 20 ml/80 g and 15 ml per 20 litres of water, respectively and the untreated. The result revealed that the spraying of all insecticides were effectiveness for controlling diamondback moth. In trial 1, the number of larvae by treated was 0.0-17.0 larvae/10 plants and marketable yield 5.4-9.2 kg/square m and significantly different from untreated. The number of larvae and marketable yield by untreated 36.3-154.0 larvae/10 plants and none marketable yield. In trial 2, the number of larvae by treated was 1.0-56.3 larvae/10 plants and significantly different from untreated. The number of larvae by untreated 16.0-86.7 larvae/10 plants. Efficiency for control diamondback moth by alternative use of Bt and the insecticldes, abamectin, chlorfenapyr, fipronil and spinosad, at 5-day interval showed no significant difference from the use of the insecticides Solely. Cabbage yields from all the treatments gave good quality.
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