By Robert B. Killingsworth (Editor), G. W. Pearce (Editor)
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The 1st NATO technological know-how discussion board was once held in Biarritz in September 1990. This Taormina convention is the second one in a sequence that we want to be an extended one and that i think that it has equalled the good fortune of its predecessor. In developing those conferences the NATO technology Committee desired to assemble best specialists to study fields of robust current curiosity.
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Extra info for Agricultural Applications of Petroleum Products (Advances in Chemistry Series 007)
Table I. ch005 (Laboratory teste) Kind of Oil 5 Minutes 20 Minutes Kerosene Refined Commercial Fuel oil (Diesel oil) Stoddard's solvent Monomethylnaphthalene 0 0 0 0 60 0 10 15 25 100 1 Hour 0 20 25 50 100 24 Hours 10 65 30 50 100 F o r years we assumed that oil killed mosquito larvae by suffocation brought about by the formation of an impenetrable layer of oil on the water surface through which the larvae were unable to thrust their breathing tubes to get oxygen. ) may cause death by actual contact and mechanical suffocation.
The Tennessee Valley Authority (52) gives the following specifications for black oil as a mosquito larvicide: Black oil should be a pure petroleum product free from fatty oils, fatty acids, resins, soaps, or other nonhydrocarbons. Sediment and sludge, insoluble i n paraffin naphtha, should not exceed 1 2 % when determined b y the methods of the American Association of State Highway Officials. The product should be a distilled or fractionated oil, and should contain no oil-well water or residue therefrom.
Figure 1 demonstrates the relationship obtained i n these tests between acid number and per cent of plant injury. 16, no apparent injury of either an acute or chronic nature occurred. ch004 leaf tip burning appeared within 48 hours after spray application. N o chronic injury was observed. 24, foliage injury increased to 4 0 % of the entire leaf area. F o r t y per cent injury was considered to constitute complete economic loss i n terms of commercial crop production. 17 may be considered the threshold between slight or no injury and economic injury.