Comparative Experiments With Various Insecticides for the San Jose Scale

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Comparative Experiments With Various Insecticides for the San Jose Scale
Stephen Alfred Forbes
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Two hundred and sixty-two gallons were used, the most of it January 4.
One thousand and ten scales taken at random from 12 trees were examined in this orchard May 27, and 26 per cent, were found alive. Generally speaking, however, the condition of the orchard was re- ported as extremely favorable. Most of the insects found were on the higher twigs, which were less heavily coated with the residue 252 BULLETIN No. 107. [April, of the spray than were the larger branches and the trunk, and the grea
...ter part of the living scales were found on such twigs. They were, as before, more abundant on the apple than on the peach. September 5 the average infestation of the 78 trees available for comparison was figured at 2. 9 degrees, which, compared with the 4. 9 of the check plot, gives a benefit of 42 per cent, from this Janu- ary treatment with the "Oregon wash. " As compared with its own January condition, this plot had been improved by 12 per cent.
10. A January spray of a lime and sulphur mixture made with soda 30 pounds of lime, 15 of sulphur, and 5 of soda, to 50 gallons of water.


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