. Better fruit. Fruit-culture. /(;// BETTER FRUIT Page 2(p and because of the scarcity of the twig- borers in the orchard it would not be wise to draw any definite conclusions without further experiments. The num- ber of trees treated with lime and sul- phur and their total freedom from borers seemed great enough when compared with the small number of check trees and other sprayed trees with quite a number of borers to justify the con- clusion that "Rex" lime and sulphur is a perfectly effecti\-e spring remedy for this pest. For some unknown reason home prepared lime and sulphur used
. Better fruit. Fruit-culture. /(;// BETTER FRUIT Page 2(p and because of the scarcity of the twig- borers in the orchard it would not be wise to draw any definite conclusions without further experiments. The num- ber of trees treated with lime and sul- phur and their total freedom from borers seemed great enough when compared with the small number of check trees and other sprayed trees with quite a number of borers to justify the con- clusion that "Rex" lime and sulphur is a perfectly effecti\-e spring remedy for this pest. For some unknown reason home prepared lime and sulphur used at the same time as the "Rex" spray, but in another orchard, apparently did very little good. Mr. W. T. Clarke, in bulletin 144 of the California Experiment Station at Berke- ley, gives some interesting data in regard to sprays applied at different times of the winter and spring for the control of twig-borer. He found that during the winter season the little larvae, in their hibernating cells, could not be killed either with kerosene emulsion or lime and sulphur. He discovered, however, that the larvae become active in these cells for some time in the spring before emerging, and that during this period of activity the cells are rendered more or less permeable to a spray, and then the larvae can be successfully combated with a contact insecticide. In regard to the effective use of a spring spray of lime and sulphur Mr. Clarke says: "The lime-salt- and-sulphur-sprayed trees, when the spraying had been done in the early spring, showed the most satisfactory results of any at the time of examina- tion. On the various station orchards, comprising over ]2,000 peach trees, the average number of bud worms was about one to every ten trees, and this average was maintained on many orchards in the district. Indeed, it was a difficult matter to find the worms in these orchards, and it was only by the closest scrutiny of the trees that they could be located in them. The genera
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