Invasive Species Compendium

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Abstract Full Text

Resistance of local castor genotypes to Achaea janata Linn. and Spodoptera litura Fabr.

Abstract

Four local genotypes of castor, Ricinus communis Linn viz. Local red (gloomy), local red (non-gloomy), local green (gloomy), and local green (non-gloomy), evaluated for their resistance to two major defoliators viz. semilooper, Achaea janata L. and tobacco caterpillar, Spodoptera litura Fabr. under the rainfed agro-ecosystem of Manipur showed significant differences in resistance to the defoliators in different degrees of defoliation. Local red-gloomy genotype emerged was the most resistant with the least mean population record of both the defoliators and consequently, the lowest defoliation to a tune of 39.20%. Local green non-gloomy genotype was found to have the least resistance with highest population record of semilooper (5.15/plant) and tobacco caterpillar (6.75/plant) causing the most severe defoliation of 42.50%. Powdery varieties showed more consistency of resistance to the insects with lower defoliation than the non-gloomy ones.