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Population Dynamics of the Diamondback Moth and Control of Lepidopteran Insects on Cabbage in the Rainy Season

Cabbage production is seldom undertaken in southern Nigeria due to difficult climatic conditions and stress from pests and diseases. To increase producer confidence in cabbage production, appropriate insecticides to minimize insect pest damage and increase yield were tested. The trials were carried out during the 2004 and 2006 rainy seasons. The synthetic insecticides chlorpyrifos (Termex®), cypermethrin+acetamiprid (Conquest®), and the natural insecticide neem (Azadirachta indica A. Juss) seed oil extract were used. The insecticides significantly reduced the populations of diamondback moth, Plutella xylostella L., and the cabbage head caterpillar, Crocidolomia binotalis Zeller. There was an increase in male adult diamondback moth populations during cabbage head formation and a decrease after harvest. Thereafter, a slight population increase was observed in the regrowth. The percentage of plants with unmarketable heads was lower for plots treated with chlorpyrifos in 2004 than in the control only. In 2006, the treated plots had significantly lower percentages of plants with damaged heads. Plots treated with chlorpyrifos, cypermethrin+acetamiprid, or neem seed oil extract had higher yields than the untreated plots, although these were not significantly different.