Effect of Dendranthema on Cotesia plutellae parasitism in brassicaceous crops: control of diamondback moth, Plutella xylostela
2009
Phyoe Wai Htum | Wine New New Oo
In Myanmar, the infestation of the diamond backmoth (DBM) was considered as one of the major constraints to cruciferous vegetable production. DBM becomes resistant to many pesticides and uses of pesticides cause damages not only to the environment but also to the farmers. It is safer and cheaper than pesticides to plant selected flowers into brassicaceous crops in the control of diamondback moth: Two commercial fields of each of cabbage, cauliflower, and kale, with active spraying programmes, were used and all were under same treatment. The larval population was examined before the treatment and repetition was carried out after 14 days. Parasitism rate of diamondback moth larvae by Cotesia plutellae was significantly higher in the fields adjacent to Dendranthema than away. C. plutellae parasitism rate occurred highest in cabbage plants (61.11%) and lowest in Kale plants (25%) when planted adjacent to Dendranthema flowering plot but DBM larval population was not significant. Serious elimination of adult parasitoids occurred with the use of pesticides at their recommended doses. DBM population was 0.71, 0.6, and 0.2 larva/plant in Kale, cauliflower, and cabbage respectively, but small white butterfly population was significantly higher in adjacent plots as the result of Dendranthema plant.
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