ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effect of crop protection and harvesting on seed mycoflora of groundnut.

Chetana Patil; Nagaraja, A.;

Karnataka Journal of Agricultural Sciences Year: 1999 Vol: 12 Issue: 1/4 Pages: 206-209 Ref: 6 ref.

1999

บทคัดย่อ

Field experiments were conducted during 1996 at the Main Research Station, Dharwad, Karnataka, India, to determine the effects of crop protection, variety and harvesting date on the seedborne mycoflora of groundnut. Six popular groundnut varieties were planted, TMV-2, Dh-40, Dh-3-30, JL-24, TAG-24 and R-8808, and the seed crop was protected by leaf spots caused by Cercospora arachidicola [Mycosphaerella arachidis] and Cercosporidium personatum [Mycosphaerella berkeleyi] with sprays of chlorothalonil at 2 g/litre at 15 day intervals. The crop was harvested at 2 stages, the first at normal maturity, and the second 2 weeks later. Colonization by different fungi on 100 randomly selected seeds was assessed prior to storage and after 6 months storage by using the blotter test. The fungi associated with the groundnut seeds were Aspergillus sp., Macrophomina and Rhizopus sp. Maximum colonization by all three fungi occurred in seeds from unprotected plots coupled with delayed harvesting. Among the differ

ent varieties, Aspergillus infection was greatest on TAG-24, Rhizopus on TMV-2 and Macrophomina on Dh-40. At the end of the storage period the same genera were recorded but the % colonization had increased. Lower rates of colonization by all three fungi were recorded from the chlorothalonil sprayed crop and from the timely harvested crop. Seed colonization by Aspergillus was greatest on TAG-24 followed by TMV-2, R-8808, Dh-3-30, JL-24 and Dh-40. Macrophomina only colonized seeds of Dh-40.