. Diseases of fruits and nuts. Fruit; Nuts. 126 California Agricultural Extension Service [Cir. 120 second application of spray, when the nuts are about the size of large peas or small olives, has been recommended in the past. While such a spray gives additional control, there is considerable danger of spray burn when it is used. Either application of spray may burn the trees when conditions conducive to such injury, climatic or otherwise, are present. Spray burn may lead to an increased percentage of nuts of in- ferior grade due to shriveled kernels. This effect is more pronounced in older tr
. Diseases of fruits and nuts. Fruit; Nuts. 126 California Agricultural Extension Service [Cir. 120 second application of spray, when the nuts are about the size of large peas or small olives, has been recommended in the past. While such a spray gives additional control, there is considerable danger of spray burn when it is used. Either application of spray may burn the trees when conditions conducive to such injury, climatic or otherwise, are present. Spray burn may lead to an increased percentage of nuts of in- ferior grade due to shriveled kernels. This effect is more pronounced in older trees and on those which have been sprayed after the growth is well advanced, as for instance when given a second spraying as above sug-. Fig. 68.—Walnut blight on shoots. gested. On account of these bad effects of bordeaux mixture on walnuts, many other fungicides are being tested for control of blight in the hope of finding something which will be effective and also free from danger of undesirable effects under any circumstances. The best results to date have been obtained by the use of a spray composed of 1 pound of red cuprous oxide (see p. 158) and 1 pint of Orthex'''' in 50 gallons of water. Trial of this spray is suggested to growers who have had injury to wal- nuts from bordeaux mixture. Another walnut-blight spray which is recommended in Oregon is copper oxalate,'* 2 pounds in 50 gallons of water. Control of blight was obtained with this spray in experiments in ^ A commercial spreader made by the California Spray Chemical Co., Eichmond, California. ^ This material may be obtained from the Mountain Copper Company, Martinez, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smith, Ralph E. (Ralph Eliot), 1874-1953. Berkeley, Calif. : The College of Agriculture, University of California
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