Abstract
White Jabon (Anthochepalus cadamba Miq). is one of the tree species that has high prospects for industrial plantations and reforestation (greening) in Indonesia because it has very fast growth, very good adaptability. Disorders of plant disturbance organisms most commonly found in Jabon, Jabon caterpillar (Arthroschista hilaralis) become a major problem that can reduce the quality and quantity of wood. Pest control with chemicals does not provide maximum results so it is necessary to test with biopesticides. The study to examine the effect of gamal leaf extract as a natural insecticide was carried out using a completely randomized design with four treatments, namely the concentration of gamal leaf extract 0% (P0), 50% (P1), 75% (P2), 100% (P3). The results showed that gamal leaf extract as a vegetable insecticide had a positive effect on the mortality of A. hilaralis larvae in Jabon plants. The higher the concentration of gamal leaf extract, the higher the mortality rate in A. hilaralis larvae. This can be seen in the most effective concentration is the concentration of 100% with a mortality rate of 95%. The highest total mortality of A. hilaralis larvae occurred at a concentration of 100% ie 2.1 head / day. The higher the concentration of gamal leaf extract, the higher the speed of death of the larvae
Highlights
Jabon putih (Anthochepalus cadamba Miq). is one of the tree species that has a high prospect for industrial plantations and reforestation in Indonesia, due to its very fast growth, its ability to adapt to various growing conditions, its relatively easy silvicultural treatment, and relatively free from pests and diseases serious
A. hilaralis which died due to the treatment of biopesticides of gamal leaf extract has poisoned the stomach because it sucks up liquid that has been sprayed onto the leaves of Jabon as a test medium which is food from the caterpillar
The highest mortality rate of A. hilaralis larvae was found in the treatment with 100% gamal leaf extract concentration of 2.1 head / day while the lowest was found in the control, 0.2 tail / day (Table 2, Figure 2)
Summary
Jabon putih (Anthochepalus cadamba Miq). is one of the tree species that has a high prospect for industrial plantations and reforestation (greening) in Indonesia, due to its very fast growth, its ability to adapt to various growing conditions, its relatively easy silvicultural treatment, and relatively free from pests and diseases serious. The results of the study by Nukmal, N., Utami, N., & Suprapto (2010) prove that the polar (water and ethanol) extract of gamal leaves can cause 100% death in the dementia booster pest (Quadrastichus erythrinae) after 72 hours of treatment on a laboratory scale. The application of biopesticides from gamal leaf extract was carried out in the afternoon by spraying white jabon leaves and A. hilaralis larvae using a hand sprayer with concentrations of each treatment 0%, 50%, 75% and 100%.
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