Abstract:

To explore the allelopathy of muskmelon decaying substances and continuous cropping on muskmelon, this paper studied the effect of decaying substances on Fusarium oxysporum mycelia growth and spore emergence of continuous cropping of muskmelon on Fusarium wilt through pot experiment in greenhouse. The results showed that the much higher muskmelon wilt disease incidented, the more significantly the diseased survival inhibited growth of the next decaying stubble. Compared with CK, quantity of spores of healthy plants, mild diseased plants and severe diseased plants increased 29.98%, 53.44% and 48.51%, respectively. Spore emergence ratio increased 15.82%-37.86%. The resistance of muskmelon was reduced by its root’s decaying substances. After inoculation with Fusarium oxysporum, disease of Fusarium wilt aggravated and the growth of muskmelon declined with the content of decaying substances increasing. 100% muskmelons continuous cropping decreased shoot weight 179.23%, root weight 249.16% respectively, while ratio of diseased plants increased 77.27%. 20 wild isolates and 20 REMI mutants of Trichoderma obtained by screening of method of fungi growth，could be degraded muskmelon survival, alleviated its autotoxicity, and reduced Fusarium wilt of muskmelon.