Effect of the Insect Growth Regulators Diflubenzuron and Methoprene on Scale Insects12

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Abstract
Larval stages of 2 diaspids, Chrysomphalus aonidum (L.) and Aonidiella aurantii (Maskell), and 2 coccids, Saissetia oleae (Olivier) and Ceroplastes floridensis Comstock, were sprayed with the insect growth regulators diflubenzuron and methoprene. No effect of diflubenzuron on the development of the insects tested was noticed. Methoprene at a concentration of 0.015% inhibited emergence of male C. aonidum when applied to 1st or 2nd instars, and at 0.1% prevented emergence of male A. aurantii when treated as 2nd instars. Development of female C. aonidum treated as 1st instars was inhibited after application of 0.05% methoprene. Females of the 2 armored scales were not affected when subjected to methoprene as 2nd instars. The development of S. oleae and C. floridensis, which are uniparental in Israel, was severely affected by methoprene treatment at a concentration of 0.015 and 0.03%, respectively.