Cocoa pod rot is one of the biggest scourges for farmers and\nbusinesses in Indonesia. This disease not only causes quantitative\nlosses in harvest but also degrades the quality of the beans that can\nstill be harvested, resulting in a double blow to farmers\u2019 incomes.\nUnderstanding the causes, symptoms, and control solutions for this\ndisease is mandatory knowledge for anyone involved in cocoa\ncultivation.<\/p>\n
The disease is caused by the fungus Phytophthora palmivora, a\npathogen capable of surviving in the soil for years. During the dry\nseason, its spores persist in the soil as thick-walled cysts. Cocoa pod\nrot is a major limiting factor in production, attacking both young and\nmature pods. There are seven identified species of Phytophthora in the\nfield, but four main species are known to infect cocoa: Phytophthora\npalmivora, P. megakarya, and P. capsici. Alongside the cocoa pod borer\n(Conopomorpha cramerella), this disease has caused substantial\nproduction and economic losses worldwide.<\/p>\n
The development of pod rot is heavily influenced by the microclimate\naround the plant. The pathogen has a wide host range and proliferates\nrapidly when air humidity reaches around 87.1 percent with an average\ntemperature of 25.3 degrees Celsius. Infection can only occur if water\nis present on the surface of the fruit, whether from rain or\ncondensation. Rainfall is the primary trigger for the spread of the\ndisease. High humidity aids spore formation and increases infection, as\nrain helps disperse spores while raising the humidity of the plantation.\nConsequently, the fluctuation in disease intensity tends to mirror daily\nrainfall patterns, with peak disease intensity occurring one to three\nweeks after peak rainfall. Cultivation practices such as pruning, plant\ndensity, mulching, drainage, fertilisation, and harvesting also\nsignificantly affect the severity of the disease.<\/p>\n
Early detection is crucial to prevent the disease from spreading\nthroughout the plantation. Cocoa pod rot begins with the appearance of\nsmall spots on the fruit about two days after infection. These spots are\ninitially brown, then turn blackish and expand rapidly until the entire\nfruit is covered. If not addressed promptly, the fruit becomes\ncompletely black within 14 days, and the internal tissue, including the\nbeans, forms a mummy which serves as a primary source of subsequent\ninfections. White mycelium appears on the surface of the infected fruit\nand becomes denser as the disease progresses. Pod rot can occur at any\ngrowth stage, from small fruit to near-ripe pods. The discolouration\ntypically starts at the tip or near the stalk and quickly spreads,\ncausing the entire fruit to rot within 14 to 22 days before finally\nturning black. Symptoms can appear on the middle, base, or tip of the\nfruit.<\/p>\n
The economic damage extends beyond the loss of harvested fruit. In\naddition to quantitative losses, beans from infected fruit have a low\nfat content, are non-uniform in size, and taste bitter, causing their\nmarket price to plummet. This makes pod rot a dual threat, reducing\nharvest volume while simultaneously lowering the value of any\nsalvageable beans.<\/p>\n
Effective management of cocoa pod rot requires a comprehensive\napproach rather than relying on a single control method. The most\neffective strategy is a sustainable Integrated Pest Management (IPM)\napproach, which combines two or more developed control techniques.\nStrict garden sanitation is the most fundamental step, involving the\nroutine removal and destruction of all fruit showing symptoms of rot.\nInfected fruit must not be left unattended; sick fruit should be buried\ndeep in the soil or burned to destroy the inoculum source, rather than\nbeing left under the tree. Sanitation is the cheapest and most effective\nmeasure in controlling this disease. Good cultivation practices form the\nnext pillar of control, where regular pruning to open the canopy and\nimprove air circulation is essential to reduce humidity around the\nfruit. Managing shade trees and applying balanced fertilisers help\ncreate healthier plants that are more resistant to disease. In certain\nsituations, chemical control with fungicides may be necessary as an\nadditional measure, where the application of copper-based protective\nfungicides, such as Bordeaux mixture, can protect fruit from\ninfection.<\/p>", "url": "https:\/\/jawawa.id\/newsitem\/cocoa-pod-rot-disease-and-its-complete-solutions-1784479859", "image": "" }, "sponsor": "Okusi Associates", "sponsor_url": "https:\/\/okusiassociates.com" }