Abstract

Aim of the study was to evaluate feeding deterrent activity of cold and hot water extracts of Melia azedarach and Phytolacca dodecondra plant parts against cabbage flea beetle, Phyllotreta cruciferae. Tap water was used for cold water extraction and 100°C boiled water was used for hot water extraction. Five concentrations (w/v) such as 0.625, 1.25, 2.5, 5 and 10 g, respectively of powder/100 mL of water was used to check feeding deterrent activity by leaf discs method. Feeding deterrent activity of plant extracts was monitored for 24, 48, 72 and 96 h, respectively post exposure period with 24 h interval. In addition, mean number of feeding holes were recorded after 96 h post exposure period. The cabbage leaf disc treated with 10 g/100 mL of plant extracts recorded 100% feeding deterrent activity after 24 h exposure period. After 48 h exposure period, except for Melia mature fruit (96.6%) remaining all the extracts recorded 100% feeding deterrent activity at 10 g/100 mL treatment. After 72 h exposure period, at higher concentration (10 g/100 mL), feeding deterrent activity of cold water extract of Phytolacca leaf (96.6%) was on par with hot water extract of Phytolacca leaf (96.6%) and immature fruit (96.6%). After 96 h exposure period, except for hot water extract of Phytolacca leaves (93.3%), remaining all observed 100% feeding deterrent activity at higher concentration. The mean numbers of feeding holes were decreased in increased concentration of the plant extracts. Irrespective of the concentrations, minimum feeding hole was observed at 10 g/100 mL of cold and hot water extract treatment. These two plant extracts proved to be effective by preventing feeding nature of the insects under laboratory. If these plant extracts may provide similar results under field condition it may be useful for controlling flea beetles damage in cabbage crops.

Keywords:

Feeding deterrent , feeding holes, flea beetle, Melia azedarach, Phyllotreta cruciferae, Phytolacca dodecandra, plant extracts,

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