บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Isolation and pathogenicity of avocado post-harvest pathogens from Westfalia and other avocado producing areas.

Korsten, L.; Sanders, G. M.; Grosse-Wieschede, E.;

Yearbook - South African Avocado Growers' Association Year: 1994 Vol: 17 Pages: 46-48 Ref: 4 ref.

1994

บทคัดย่อ

Isolation and pathogenicity of avocado post-harvest pathogens from Westfalia and other avocado producing areas.

ABSTRACT

A survey of postharvest pathogens occurring on avocado fruit originating from Westfalia, Tzaneen, Mooketsi, Levubu, Louis Trichardt, Rustenburg, Kroondal and Avonridge, South Africa, was carried out at weekly intervals for 1 month in 1989. In each area, at each sampling date some variation in the isolation rate of the pathogens was noted. Colletotrichum gloeosporioides [Glomerella cingulata] (23.9%) and Dothiorella aromatica (20.4%) were isolated the most frequently. Lasiodiplodia theobromae [Botryodiplodia theobromae] was not isolated from fruit collected in the Tzaneen area. The least frequently occurring fungi included Thyronectria pseudotrichia (1.1%), Trichothecium roseum (0.1%), Fusarium solani (0.1%) and Drechslera setariae [Cochliobolus setariae] (0%). In pathogenicity tests Fuerte fruit inoculated with each of the 9 isolated pathogens developed lesions varying in size from 11.5 cm2 for Pestalotiopsis versicolor to 83.8 cm2 for T. roseum. Inoculating fruit on the side was more effective

than stem-end inoculation for symptom development. Reisolation of all pathogens (except C. setariae and Phomopsis perseae) from artificial inoculations was significant at the 5% level.