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Effects of malic acid and oxalic acid on oviposition of Helicoverpa armigera were investigated in a laboratory cage choice experiment. Malic acid stimulated oviposition at a concentration of 0.6 μmol/cm2 but inhibited it at 3.4 μmol/cm2. Oxalic acid showed neither stimulation nor inhibition of oviposition at 0.25–1.7 μmol/cm2. Correlations between the amount of these acids in trichome exudate on leaf...
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