Evaluation of trunk injection device performance for controlling Rhynchophorus ferrugineus and translocation of two insecticides in date palm trees

الملخص EN

Field trials were conducted in date palm trees to determine some operating parameters influencing the performance of trunk injection device for controlling red palm weevil, Rhynchophorus ferrugineus Oliver, under different factors, (palm age, different pressures, and doses).

The controlling time, device productivity, energy requirements, controlling cost and efficiency percentages were calculated.

The effect of translocation and residues of chlorpyrifos and profenofos in date palm trunk and fruits were studied.

Results indicated that maximum controlling efficiency of 100% was obtained in the case of 2 holes / infestation place and 300 KPa pressure for young trees, while 400 KPa for medium and old trees.

Maximum controlling cost 7.78 L.E / palm were obtained in case of 2 holes and low pressure 200 KPa in old trees.

Residues of chlorpyrifos and profenofos in the trunk pulp, above and below 50 cm the area of injection, and in date fruits were determined by a gas chromatographic method.

No residues were found in dates, for both insecticides, two hours after the injection.

Maximum residues of chlorpyrifos and profenofos in dates reached 0.052 and 0.42 ppm after 1 and 3 days from the injection, respectively.

This study also indicates the translocation of the two insecticides through the plant vessels above and below the injection point following the use of the injection device although they are non-systemic