Behavioral response of (McGregor) (Acari: Tetranychidae) to synthetic chemicals and oils.

BACKGROUND

(McGregor) (Acari: Tetranychidae) population outbreaks after the citrus plantation's chemical application is a common observation. Dispersal behavior is an essential tool to understand the secondary outbreak of population. Therefore, in the current study, the dispersal activity of was observed on the leaf surfaces of (Rutaceae) treated with SYP-9625, abamectin, vegetable oil, and EnSpray 99.

METHOD

Mites were released on the first (apex) leaf of the plant (adaxial surface) and data were recorded after 24 h. The treated, untreated, and half-treated data were analyzed by combining the leaf surfaces (adaxial right, adaxial left, abaxial right, and abaxial left). All experiments were performed in open-air environmental conditions.

RESULTS

The maximum number of mites was captured on the un-treated or half-treated surfaces due to chemicals repellency. Chemical bioassays of the free-choice test showed that all treatments significantly increased the mortality of depending on application method and concentration. A significant number of mites repelled away from treated surfaces and within treated surfaces except adaxial left and abaxial right surfaces at LC. In the no-choice test, SYP-9625 gave maximum mortality and dispersal by oils than others. No significant differences were observed within the adaxial and abaxial except abaxial surface at LC. Therefore, the presence of tested acaricides interferes with dispersal within leaf surfaces of plantations depending on the mites released point and a preferred site for feeding.