Population dynamics and chemical control of two diaspid scales infesting mango trees

الملخص EN

In the present work, an effort was made to study some ecological aspects and chemical control of two diaspid scales, ie, white mango scale, Aulacaspis tubercularis Newstead and olive parlatoria scale, Parlatoria oleae (Colvee) (Hemiptera: Diaspididae) on mango trees in Nobaria district, Beheira governorate, Egypt.

The study lasted for two years from the beginning of 2019 to the end of 2020.

The results showed that the total population of the white mango scale recorded three peaks on mango trees.

The three peaks occurred on January 15th, March 12th and September 17th throughout the 1st year, 2019.

In the consecutive year, 2020 such three peaks were recorded on January 21st , March 31st and September 22nd .

The mango leaves at the middle stratum and the east direction were the most preferred leaves by A.

tubercularis.

On the other hand, three peaks were recorded by P.

oleae on March 26th, May 21st and October 8th during the first year, and on March 17th, June 19th and September 29th during the 2nd year.

The leaves at the lower stratum and the tree core were the most preferred leaves by P.

oleae.

Both scale species significantly preferred the upper surface of mango leaves to the lower one.

The efficacy of four insecticides, ie, botanical insecticide, mineral oil, IGR and neonicotinoid insecticide for controlling the two scales were estimated to ensure that acetamiprid was the highly effective insecticide against A.

tubercularis, and pyriproxyfen was the highly effective one for P.

oleae.

A.

tubercularis was more tolerant to the tested insecticides than P.

oleae.