|Rice Disease Control-88
Project Leader and Principal UC Investigators
Robert Webster,professor, Dept. of Plant Pathology, UC Davis
With the increasing interest in plowing under rice residue instead of
burning it, in fallowing between rice crops and in using green manure, a
crucial question must be asked.
What effect do those practices have on the severity of rice diseases? A major effort during 1988 was to set up research sites and to start collecting data:
These systems are being compared:
Organisms under scrutiny
In addition, studies were launched to develop biocontrol of rice diseases-in particular, the use of beneficial organisms. To do this, it is necessary to monitor microflora on rice, isolate and identify them, and scientifically determine their potential for disease control and residue degradation.
Experimental activities during 1988 included:
Preliminary results revealed about 80 different fungi and 60 different bacteria, some of which show evidence of activity against rice disease organisms.
Since there are indications that current fungicides may not be available to control seedling disease after this year, field tests of possible replacements were conducted. Apron®, Anchor, Vitavax®, Maneb® and Gus-F-44 were tested at two sites, with Captan® as a standard. The performance of Apron® and Anchor® was comparable to Captan®. All three were significantly better than the untreated controls.
In addition, plant pathologists: