Influence of soil flooding on cacao root infection by Phytophthora SPP. In: Agrotrópica v. 6 p. 53-60, 1994.

Abstract

Cacao seedlings were subjected to 48 hours of flooding every week, during 8 weeks, after inoculation with different forms of inoculum of Phytophthora capsici, P citrophthora, P heveae, P megakarya and P palmivora. Soil was infested with 2 x 105 zoospores per plant, 100 or 200 chlamydospores or 100 or 250 oospores per gram of soil. Eight-week-old cacao seedlings of a susceptible (SIC 19) and a tolerant cultivar (PA 121) were used and 20 plants of each cultivar were inoculated with each species, form or dosage of inoculum. The inoculated plants and controls were harvested 8 weeks after inoculation and their root system plated on PARPH.