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DECREASE OF CHILI PEPPER WILT (Phytophthora capsici Leo) WITH ASCENDING ANTAGONIST COMPLEXITY IN SUBSTRATES FOR CHILI PEPPER (Capsicum annuum L.) GERMINATION



DECREASE OF CHILI PEPPER WILT (Phytophthora capsici Leo) WITH ASCENDING ANTAGONIST COMPLEXITY IN SUBSTRATES FOR CHILI PEPPER (Capsicum annuum L.) GERMINATION



Interciencia 35(8): 613-618



In general, biological control of soil-borne disease has not been efficient under field conditions, when reintroduction to the soil of increased amounts of a single antagonist isolate has been applied. This study attempted to reintroduce consortia antagonistic to Phytophthora capsici with ascending complexity (8, 16, 24 and 32 isolates), into the chili pepper (Capsicum annuum) germination substrate, so as to achieve its establishment, overcoming soil homeostasis and allowing for production of the crop. Under greenhouse conditions, the lowest disease incidence (p <= 0.05) was observed in the treatment with the consortium with eight actinomycetes. Under field conditions, all the treatments with antagonists had lower incidence (p <= 0.05) than control. Among the antagonist consortia that were efficient in the field, the one with the highest complexity showed the lowest wilt ncidence (p <= 0.05). Both in greenhouse and field tests, the presence of consortia of antagonists decreased the incidence of chili pepper wilting in comparison with the control.

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