Resistance to Aphis gossypii Glover among muskmelon cultivars ct on the development and fecundity of parasitoid, Aphelinus mali Haldman
| Autor: | Jih-Zu Yu, 余志儒 |
|---|---|
| Rok vydání: | 1994 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 82 Resistance to cotton aphid, Aphis gossypii Glover was compared among muskmelon (Cucumis melo L.) cultivars, Tainan 8 (TN.8), Tainan 9 (TN.9) and Autumn favor (C.T.), to assess the possibility of controlling cotton aphid by using aphid- resistant cultivar and parasitoid, Aphelinus mali Haldeman. Results revealed that TN.8 was the most susceptible cultivar, while TN.9 and C.T. were resistant with antibiosis effect of the development and reproduction of cotton aphid by no choice test. In free choice test, the highest population score was found on TN.8 for each aphid colony, and the lowes was on TN.9 at 5 days after aphid released. Results from these two tests suggested that TN.9 was more resistant that C.T.. Both of them could delay the population increment of cotton aphid with antibiosis and antixenosis. The influence of preconditioning host cultivars showed significant difference among various aphid conlonies which tamed from three different mudkmelon cultivars, respectively. on the longevity and body weight of apterous adult when tested on C.T., number of progeny produced per adult on TN.8, and survival rate of progeny on all cultivars. Host conditioning influenced antixenosis of C.T. by exhibiting the same level as Tn.9 when tested with preconditioned aphid colony of TN.8. but was lower than TN.9 when tested with the other two colonies, and the odor preference to host plant cultivars. Population growth ofsypii in field showed the slowest on TN.9, may delay the population increment of the cotton aphid. Aphid-resistant muskmelon cultivars had no negative impact on A. mali. No matter the host aphids werer from aphid-resistant or suscceptible mudkmelon cultivars.Resistant cultivars may complement the activity of the parasitoid in reducing cotton aphid. The compatibility between aphid-resistant mudkmelon cultivars and parasitoid is good, therefore, it can be incorporated in the integrated pest management program for controllong the cotton aphid population on muskmelon. |
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