| The effect of tomato defensive resistance induced by the root-knot nematode Meloidogyne incognita on the development and survival of whitefly Bemisia tabaci, which share the same host plant on shoot, were investigated.Before the investigation, three concentrations of nematode M.incognita 2nd infective juveniles (200, 500 and 1000 juveniles/plant) were used to induce the tomato defensive resistance by damaging host plant root, then whitefly adults were introduce to lay eggs on the shoot of same plants 3, 7 and 11 d after nematode infection.Results indicated that, the developmental time of B.tabaci immatures on the nematode damaging tomato plant were markedly delayed comparing to those on the control plants, regardless the nematode concentration and infection duration, and the differences of the B.tabaci developmental time between those on control plants and on the 500-and 1000-juveniles infected plants in the 3-and 7-day experiments were significantly to each other.Similar trend was found in the B.tabaci survivorship investigation, the more nematode infected on the tomato plants, the lower survivorship of B.tabaci immatures were recorded, and the B.tabaci survivorships on 500-and 1000-juveniles infected plants were all significantly lower than those on the control plants, regardless the time nematode infested the tomato plants.Our study revealed that, nematode induced host defensive resistance has a obviously negative effects on the biology of whitefly B.tabaci. |
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