海南省番木瓜果实潜伏侵染真菌种类及其分布状况的研究

THE SPECIES AND DISTRIBUTION OF LATENT FUNGI OF PAPAYA FRUIT IN HAINAN PROVINCE

1990～1992年,通过对外观无病和无伤口的健康番木瓜果实进行分离和致病性测定及贮藏期发病调查,探明在我国海南省各种植区,番木瓜果实的果皮中均存在多种真菌的潜伏侵染。其中以Colletotrichum gloeoasporioides发生最普遍,致病性最强。其次Trichoderma sp., Alternaria sp.和Fusarium sp.,不同气候类型区,潜伏真菌种类相似,但潜伏菌量有差异,以雨量充沛,温度较高的东部地区潜伏菌量为最高,潜伏真菌集中于果蒂附近。

The occurrence of latent infection of pathogenic fungi on papaya fruit in Hainan Province was proved by the authors' research work, since 1990 to 1992 the authors made isolations and culture from the fruits which are outwardly free of symptom and wounds, made inoculation and investigations of their incidence in storage. The most common occurrence and the most severe pathogenicity are Colletotrichum gloeosporioides in latent fungi, in addition, number and pathogenicity of Trichoderma sp. , Alternaria sp. , and Fusarium sp. are less than C. gloeosporiordes. The species of latent fungi don't vary, but the number of latent fungi differ from various climates. The most carrier percentage of latent fungi are divided in the east of Hainan Province, where the conditions of moisture and heat are the best, and the carrier percentage is the most lowest in the midarea of Hainan, Where the temperature is low and the rain is enough. A great number of the fungi of latent infection live around the stem-end of the fruit.