Open AccessEffect of Trichoderma spp. and potassium fertilizer on Phytophthora palmivora infection in cacao seedlings
Author(s) -
Rita Harni,
Widi Amaria,
Yulius Ferry,
Luluk Sutji Marhaeni
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/418/1/012015
Subject(s) - phytophthora palmivora , trichoderma , potassium , potash , fungicide , horticulture , fertilizer , inoculation , biology , randomized block design , blight , incubation , agronomy , phytophthora , chemistry , organic chemistry , biochemistry
Phytophthora palmivora is a pathogen that causes black pod, leaf blight, and stem cancer on cacao, that cause yield loss up to 40%. Control of P. palmivora is intended to make plants healthy, by using Trichoderma spp. and potassium fertilizer. The study was aimed to determine the effect of Trichoderma spp. and potassium fertilizer application against P. palmivora infection in cacao seedlings. The study used a randomized block design consisting of 13 treatments with 5 replications. The treatments were Trichoderma spp. (T. atroviride JB2, T. amazonicum LP3, T. hamatum LP2), and potassium fertilizers dosages (1, 2 and 3 g), chemical fungicides (mancozeb) for comparison, and control. Cacao seedlings were treated with Trichoderma spp. and potassium fertilizer, then the plants were inoculated with P. palmivora. Observations were on attack symptoms, incubation period, disease severity, growth of cacao seedlings, and lignin content. The results showed that the application of Trichoderma spp. and potassium fertilizer prolonged the incubation period and reduced the number of leaves spots (48.95–75.37%). T. amazonicum + 3 g of potassium fertilizer and T. hamatum + 2 g of potassium fertilizer suppressed the number of spots up to 75.37% and 71.36% respectively, higher than chemical fungicides that were 70.86%.