Lemon is an important crop in the market. And worms are considered a pest species that damage to the lemon tree is huge. Yam bean is an important crop in the district Borabue. Mahasarakham province The study found that The yam seed that contains a potent pesticide types. The preparation was conducted by leading seed yam was extracted using a solvent, three types of ethanol, hexane and water, the study found that ethanol can be extracted from the seed yam was 3.1858 grams thought. 6.3716% hexane as the extraction of seed yam can be accounted for 15.3218% 7.6609 grams and can not extract from the seed yam. The solvents suitable for use in the extraction of seed yam hexane and tested effective in eliminating the worms eat the leaves of yam bean extract. Found that an extract of the seed yam soaked in solvent hexane eradicate the worms eat the leaves better than other solvents. It takes an average of 10.5 minutes.