الفهرس | Only 14 pages are availabe for public view |
Abstract Moloukhia, cowpeaand tomato plants were treated with prothiofos and sulprofos at tre rates of 1000 and 720 grams active ingredient per feddan r~pectively uSing the emulsifiable concentrate fonwulations 43, 87 and 77 days after planting at Kaba, Kalyobia Gevernorate during 1979 Chemical analYses for the resisdues were conducted utilyzing gas chromatographic and thin layer techniques. The results indicated the ~ollowing: I-Higher deposits were detected where prothiofos was Used indicating tr~ Correlation between the concentration of the pesticidal chemical and too amounts of residues detected. 2- The highest l’,’vel of residues were found on and in molcukhia le’,ves While tre lowest were those on <ind in tomato fruits. This finding demonstrat!,d the relationship between the treated surface and the amounts of residues deposited. 3- The initial depOSits were 50.58 and 42.54 ppmon and in moloukhia leaves, 17.66 and 5.01 ppmon and in cowpea. green pods and 1.29 and 0.79 ppm on and in tonnto fruits where prothiofos and sulprofos were applied respeotively. 4- StudYing the rate of persistence of the two pesticides on the three oommodities, indicated that Prothiofos residues were more persistent too t those of sulprof’os. Deposits were reduced to 49.21 and 1.2 % on and in mOloukhia leaves, to 8. 73 and 1.00 % on and in cowpea pods and to 16.28 and 10.1) % on and .in tomato fruits six days after treatment with prothiofos and sulprofos respectively. 57 Silica gel thin layer chromatographic tecnique showed the presenoe of the parent compound of prothiofos only in all the samples taken from the treated plots. Applying au sulprofos, besides the parent OOmpound, two’,other degredation compounds having the Rf values of 0.16 and 0.23: at defferent periods in the three treated commodities. 6~ Since there is no established tolerance for the two pesticidal chemicals up till now and accodring to the data obtained, it is SUggested that: a. Prothiof’o8 should not be recommended for Use on m mOloukhia plants. Treating cowpea and tomato plants, the crops xcould be-iarvested 12 and 15 days after tr treatment respectively. b. MOloukhia plants, cowpea green pods and tomato fruits could be marketed for human consumption 12, 9 and 9 days after treating the plants with sulprofo8 respectively. c. Produced matuxe cowpea seeds contained undetectable amounts of either prothiofos or sUlprofos after tre treating the plants and could be cons~d safely. |