Home
  >  
Section 8
  >  
Chapter 7,832

Studies on biological control of phytophthora blight of red pepper iii. formulations of trichoderma harzianum and pseudomonas cepacia antagonistic to phytophthora capsici and their preservation

Park, K.S.; Jang, S.W.; Kim, C.H.; Lee, E.J.

Korean Journal of Plant Pathology 5(2): 131-138

1989


Accession: 007831159

Trichoderma harzianum and Pseudomonas cepacia antagonistic to Phytophthora capsici were formulated into granule and/or powder using sodium alginate, zeolite or diatomaceous earth with intention to develop biofungicides able to apply in commercial fields. Population of T. harzianum formulated in granules increased to 180 times for 16 wk preservation at 25.degree.C but reduced 30% at 5.degree.C. Viability of P. cepacia formulated in wet granules remained better at 25.degree.C than at 5.degree.C. When the granules were kept dry, density of P. cepacia was reduced to 1.4% and 0.4% of the initial density during 8 wk preservation at 5.degree.C and 25.degree.C, respectively. Viability of T. harzianum in the powder formulation was much poor compared to that of granule formulation resulting in significant decrease in antagonistic populations regardless of preservation temperature. Amendment of rice bran as a bulking agent in alginate formulation markedly increased the viability of P. cepacia. Application of P. cepacia granules into soil provided better suppression of phytophthora blight on red-pepper seedlings compared to that of direct drenching of P. cepacia suspension, whereas the case was not true for T. harzianum.

PDF emailed within 1 workday: $29.90