Test of effectiveness Gadung tuber extract (Dioscorea hispida Dennst.) against cacao pod sucker pest (Helopeltis Spp.) in the laboratory

One of the obstacles in cacao cultivation is the presence of cacao pod sucking pest (Helopeltis spp.) which may lead to decrease the production 50-60%. Using vegetable pesticides extracts of gadung tuber (Dioscorea hispida Dennst.) is an alternative for controlling cacao pod sucking pest (Helopeltis spp.). This study aims to obtain an effective concentration of gadung tuber extract to control Helopeltis spp. The research was conducted at the Plant Pest Laboratory, Faculty of Agriculture, Riau University. The study was conducted from September 2021 to November 2021. This study used a completely randomized design (CRD) with five treatments and three replications in order to obtain 15 experimental units. The treatments that given were the concentration of gadung tuber extract 0%, 70%, 80%, 90% and 100%. Observation parameters consist of the initial time of death, lethal time 50, daily mortality, total mortality, temperature and humidity. The results showed that the concentration of 90 g.l-1 water or 9% is an effective concentration for controlling cacao pod sucking pest (Helopeltis spp.) with an initial time of death of 4.66 hours, a lethal time of 50 at 14 hours and total mortality 86.66%.