Hand pollination, not agrochemicals, increases cocoa yield and farmer income

Cocoa Agroforest in Sulawesi (Indonesia) Photo: M Toledo, University of Göttingen Agroecologists from Göttingen University compare pesticides, fertilisers, manual pollination and farming costs in Indonesia Cocoa is in great demand on the world market, but there are many different ways to increase production. A research team from the University of Göttingen has now investigated the relative importance of the use of pesticides, fertilisers and manual pollination in a well replicated field trial in Indonesian agroforestry systems. The result: an increase in both cocoa yield and farming income was achieved - not by agrochemicals, but by manual pollination. The study was published in the journal Agriculture, Ecosystems and Environment. Cocoa requires cross-pollination by insects to produce fruit. It is unclear how to encourage natural pollination by tiny midges, flies or wasps: in fact, the true identity of the main pollinators has yet to be discovered. Under natural conditions, more than 90 percent of flowers are not visited by insects and do not develop fruit.