Field experiment was carried out on heavy infested area with cot­ton leafworm larvae at Edfina district (EI-Behera Governorate) for evalu­ation the field performance of low-volume spraying machines: Economy Micro ULVA, knapsack motor sprayer Arimistu and knapsack motor sprayer Arimistu with Micronair to spray local mineral oils; CAPL1-, CAPL­2, and Solar EC., compared with the recommended insecticide (Lannate). A satisfactory coverage was obtained on clover plants and the physical properties of mineral oils (surface tension and viscosity) under field dilu­ation rate were determined, and compared with the spray coverage of the tested treatments. Results obtained indicated that, reduction percentage in cotton leafworm larvae in case of mineral oils is coincided with the percentage of lost in emulsion sprayed on ground where old larvae live, while lannate treatment showed opposite results. The suitable spraying machine dif­feres from one treatment to another i.g. Micro ULVA sprayer for CAPL­1, knapsack motor Arimistu with Micronair for CAPL-2 and knapsack mo­tor Arimistu for Solar, EC., all local mineral oils gave higher reduction percentage than lannate without any phytotoxic effect against the cot­ton leafworm larvae on clover plants. On the other hand, Solar EC could be recommended as the most cheepest, available and effective mineral oil when sprayed by knapsack motor Arimistu for controlling cotton leaf-worm larvae on clover plants.