The relationship between formulation of insecticides and droplet distribution of cetain ground spraying equipment and controlling Heteracris annulosa (Orthoptera: Acrididae)‎ infesting alfalfa plants

الملخص EN

Field experiments were carried out in an area of about 1.1 feddans planted with alfalfa Medicago sativa during season of 2019 in 5th September at El-Baharia Oasis, Western Desert, Giza Governorate.

The selected area was split into 7 plots including control plot.

Chlorpyrifos EC and U.L.V., deltamthrin E.C.

and U.L.V., spinosad and chlorpyrifos +lufenuron were sprayed with recommended rate and one treatment left without spraying as un treated check by using motorized knapsack sprayer (solo) (52.5 L./fed.) and economy micron ULVA + sprayer (3.15 L/fed.).

Data indicated that, all tested compounds induce a significant negative influence on Heteracris annulosa (Walker) (Orthoptera: Acrididae) nymphs survival.

The most effective compounds is deltamthrin E.C.

and chlorpyrifos E.C.

followed by other compounds.

It could be recommended to use those compounds with LV spraying equipment with not less than (3.15L/fed.).The data showed that motorized knapsack sprayer (solo) (52.5 L./fed.) was the most efficient equipment to control the 4th, 5th instar nymphs of H.

annulosa on alfalfa ha plants.The rate of performance of motorized knapsack sprayer (solo) was 15.2 fed./day.

But the lowest rate of performance was recorded with economy micron ULVA + sprayer since it could spray only 9.1 fed.

/day.