EFFECT OF DIFFERENT PH VALUES OF SPRAY SOLUTION ON THE EFFICIENCYOF MALATHION, Beauveria bassiana AND EXTRATONE ON Aphiscraccivora

The toxicity of chemical insecticide; malathion, bioinsecticide; beauveria bassiana and a plant growth regulator (pgr); extratone at different ph values of spray solution and its effects on some biological parameters of adult aphis craccivora under laboratory conditions were studied. data showed that malathion at lc_50 revealed more effective in acidic water, also revealed that, the ideal ph for water used for spraying fungi is alkaline (ph 8-10). data indicated that the toxicity increased as a period after treatment, malathion gave the maximum toxicity at ph 4 followed by ph 5 while biovar gave the maximum toxicity at ph 10 & 8 but extratone gave the maximum toxicity at ph values 4 followed by ph 5. malathion at lc_50 in acidic water decreased longevity, pre-parturition, parturition and post-parturition periods and mean numbers of nymphs of adult per female. biovar decreased longevity, pre-parturition, parturition and post-parturition periods and mean numbers of nymphs of adult per female at ph values 10 & 8. extratone decreased longevity, parturition periods and mean numbers of nymphs of adult per female but increased pre-parturition and post-parturition periods ph value 5.