Experiments With Insecticides for the San Jose Scale
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Tree No. 10. A fifteen- foot tree, with a seven-inch trunk and a thirteen-foot top; in fair condition, moderately infested. No water was applied to this tree, and the effect of the insecticide was modified only by the natural rainfall already referred to. Sixty- nine per cent, of the scales alive in the beginning; 77 per cent of these dead on the third day and 95 per cent, on the sixth, with a final average result of 95 per cent, destroyed.
Taking the entire group of nine trees together, withou...t refer- ence to differences of treatment subsequent to the insecticide spray, it appears that an average of 52 per cent, of the scales were alive in the beginning; that 67 per cent, of these were dead by the third day, 82 per cent, by the fifth, and 86 per cent, by the sixth; and that the final average effect of the treatment was the destruction of 86 per cent.
Second Lot of Trees. California Wash.
Nine trees, partly apple and partly peach, sprayed with lime, sulphur, and salt on the 5th of March.
What to read after Experiments With Insecticides for the San Jose Scale?
You can find similar books in the "Read Also" column, or choose other free books by Stephen Alfred Forbes to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Tree No. 10. A fifteen- foot tree, with a seven-inch trunk and a thirteen-foot top; in fair condition, moderately infested. No water was applied to this tree, and the effect of the insecticide was modified only by the natural rainfall already referred to. Sixty- nine per cent, of the scales alive in the beginning; 77 per cent of these dead on the third day and 95 per cent, on the sixth, with a final average result of 95 per cent, destroyed.
Taking the entire group of nine trees together, withou...t refer- ence to differences of treatment subsequent to the insecticide spray, it appears that an average of 52 per cent, of the scales were alive in the beginning; that 67 per cent, of these were dead by the third day, 82 per cent, by the fifth, and 86 per cent, by the sixth; and that the final average effect of the treatment was the destruction of 86 per cent.
Second Lot of Trees. California Wash.
Nine trees, partly apple and partly peach, sprayed with lime, sulphur, and salt on the 5th of March.
What to read after Experiments With Insecticides for the San Jose Scale?
You can find similar books in the "Read Also" column, or choose other free books by Stephen Alfred Forbes to read onlineMoreLess
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