The glucosinolate content of the 3 host plants, viz. yellowsarson, Brassica campestris L. var. yellowsarson, Chinese cabbage,Brassica campestris L. var.pekinensis andtaramira, Eruca sativa Lam. var. ITSA differed qualitatively as well as quantitatively mainly with respect to allyl-, methylthiobutyl-, pent-4-enyl-, methyl- and benzyl-glucosinolates. The mean number of total probes on feeding media incorporated with crude extracts containing glucosinolates from 0·25, 0·50 and 1·0 g green parts oftaramira per ml of feeding media was 5·8, 6·7 and 8·4, respectively. Such probes in case of yellowsarson and Chinese cabbage were 2·6, 2·2 and 1·5; and 2·6, 2·0 and 3·0, respectively. The mean number of probes on feeding media containing sinigrin (K+-allylglucosinolate) at the rate of 0·125, 0·25, 0·50 and 1·0% was 1·9, 3·3, 3·9 and 5·2, respectively. Uptake of feeding media incorporated with extracts containing glucosinolates fromtaramira, yellowsarson and Chinese cabbage varied from 4·05–9·40, 31·5–52·0 and 30·5–51·3%, respectively. Similarly, the uptake in the case of feeding media containing sinigrin (0·125–1%) varied from 1·6–44·95%).