Ability of introduced populations of Trichoderma atroviride bissett to control populations of Rhizoctonia solani Kuhn and Phytophthora parasitica dastur in the soil

Date

3-1991

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Virginia C. Cuevas

Abstract

LAZA, JOSEFA SUSIE, CALAPOS. University of that Philippines at Los Banos, March 1991. Abilitity of Introduced Populations of Trichoderma atroviridae Bissett to Control Populations of Rhizoctonia solani Kuhn and Phytophthora parasitica Dastur in the soil.

Adviser: Dr. Virginia C. Cuevas

The ability to Trichoderma atroviride Bissett to survive in a soil infested with two plant pathogenic fungi, Rhizoctonia solani Kuhn and Phytophthora parasitica Dastur was tested. Six treatments were made T1 - soil inoculated with Trichoderma once, no mungbean plant T1P soil inoculated once with T. atroviride, with mungbean plant; T2 - soil inoculated twice with T. atroviride no mungbean plant; T2P - soil inoculated twice with T. atroviride, with mungbean plant; T3 - uninoculated, no mungbean plant; T3P - uninoculated, with mungbean plant. Levels of population in the soil of R. solani and P. parasitica were monitored before soil inoculation with T. atroviride. The treatments were done in pots with three replicates per treatment. T. atroviride in sawdust-Mikmia carrier was inoculated at the rate of 1 gram carrier/10 g soil. After the inoculation of T. atroviride. its population and that of Phytophthora parasitica were monitored weekly by the soil dilution-pour plate (DPM). On the other hand, sclerotial bodies of R. solani in the soil were monitored weekly by the soil flotation technique. Trichoderma atroviride was able to survive and maintain a stable population in the soil. It was able to significantly reduce the population of R. solani and P. parasitica. Inoculating the soil two times with Trichoderma atroviride significantly increased its population in the soil and effectively controlled the population of R. solani and P. parasitica. Presence of host plant, vigna radiata has no significant effect on the population of T. atroviride. However, its presence increased the population of the pathogens in the uninoculated soild. The dry weight of the plants nine weeks after culture in the soil was highest in the pots inoculated twice T. atroviride and lowest in the uniboculated soils.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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