Soviet canadian entomological investigations on the influence of resistant and susceptible maize inbred lines on the fecundity of the european corn borer ostrinia nubilalis

Hudon, M.; Chiang, M.S.; Shapiro, I.D.; Pereverzev, D.S.

Annales de la Societe Entomologique du Quebec 25(1): 36-54


Accession: 006451086

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From 1969-1971, 40 maize inbred lines from 10 countries with known resistance or susceptibility to the European corn borer O. nubilalis (Hbn.) were used in the USSR and Canada to study the effect of plant resistance on borer survival and the fecundity of female moths the following generation. In Quebec, Canada, with a univoltine borer, fecundity was studied in the spring of the following year after natural overwintering conditions and, in the USSR, with a bivoltine borer, the same season. Additional information was obtained on different biological characters of the insect in both countries. Each specimen observed was kept on the same plant tissue until pupation. In Quebec, greater fecundity of O. nubilalis reared on resistant maize lines evaluated on leaf feeding injury was observed and in the USSR, on susceptible lines evaluated on borer survival at pollination time. In Quebec, leaf feeding injury was less important and total plant damage at harvest (tolerance) more reliable. Number of eggs laid/female was significantly higher in Quebec among the susceptible inbreds when they were grouped according to total plant damage at harvest. This confirms the Soviet findings on corn borer fecundity. Most biological characters of borers fed on resistant or susceptible maize were not significantly different. Earliness of maize inbreds was 1 of the factors other than the biochemical concentration of DIMBOA [2,4-dihydroxy-7-methoxy(2H)-benzoxazin-3(4H)-one] in plants responsible for corn borer resistance. Contradicting results reported previously in both countries are discussed.