Бидний тухай
Багш ажилтан
Due to the increasing outbreaks of forest pests across Mongolia, there is an urgent need to study their distribution and biological characteristics and implement effective control measures, including the adoption of international practices. This study aimed to evaluate the efficacy of oil-based formulations in controlling the eggs of the gypsy moth (Lymantria dispar). Infestation density was determined using tree shaking and branch sampling methods. Among five identified foliage and needle pests, L. dispar was dominant in outbreak areas such as Norovlin, Binder, and Bayan-Adarga, where detailed biometric measurements were taken. The Zuun Jargalant valley of Norovlin soum was chosen for field trials due to low natural predator populations (e.g., lady beetles). The average egg density was approximately 220 egg masses per square meter, with each mass containing about 280 eggs. Three oils—soybean, canola, and rapeseed—were tested. Soybean oil showed the highest efficacy, reducing hatching by up to 96%. All oils demonstrated effectiveness above 86%, meeting pest control standards. Statistical analysis showed no significant difference between pure and diluted oil formulations. Additionally, egg-stage intervention proved economically advantageous, with no egg-laying observed the following year on treated rocks.
