Abstract
losses on cocoa is black pod disease (BPD) caused by Phytophthora palmivora Butl. Alternatif control of the disease is using biocontrol agent such as Trichoderma harzianum Rifai formulated in a powder biofungicide which has to be applied in a right concentration. The research aims to observe the effect of biofungicide powder of T. harzianum in some concentrations and obtain the best consentration to control P. palmivora causes cocoa black pod disease. This research has been conducted at Plant Pathology Laboratory, Agriculture Faculty of Riau University from August to October 2015. The research was carried out experimentally using a completely randomized design consisted of 7 treatments (0, 100, 200, 300, 400, 500 and 600 g/l) and 4 replications. The research consisted of two phases: in vitro inhibition test to P. palmivora and in vivo application test of T. harzianum powder biofungicide. Data obtained were statistically analyzed using analysis of variance and continued with Duncan’s New Multiple Range Test (DNMRT) at 5% level. The results showed that the concentration of T. harzianum powder biofungicide at 500 g/l had a better ability to inhibit the growth of P. palmivora at in vitro test with an inhibition up to 45,00% and relatively able to control P. palmivora causes cocoa black pod disease at in vivo test with disease intensity 31,25%.
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