Annual report of the Board of Control of the New York Agricultural Experiment Station . em almost complete protection against the psylla. Onthe other hand the results in most plantings have been variableand quite contradictory; and in spite of annual sprayings withlime-sulphur wash before the appearance of foliage the pest has,for several seasons, made serious inroads in pear orchards true explanation for these differences has been wanting, butthe discrepancies appear to have been largely due to habits of thehibernating flies as affected by seasonal conditions. Very little was kn
Annual report of the Board of Control of the New York Agricultural Experiment Station . em almost complete protection against the psylla. Onthe other hand the results in most plantings have been variableand quite contradictory; and in spite of annual sprayings withlime-sulphur wash before the appearance of foliage the pest has,for several seasons, made serious inroads in pear orchards true explanation for these differences has been wanting, butthe discrepancies appear to have been largely due to habits of thehibernating flies as affected by seasonal conditions. Very little was known of the over-wintering adults or the circum-stances of oviposition which would appear to be essential for intelli-gent action. To these points the Station has devoted much attentionfor the purpose of determining the best conditions for effectivespraying against the adults and the eggs deposited by them. U. S. Dept. Agr. Yearbook, 1906 (1907). p. 446.•N. Y. State Mus. Bui. 147:45. 1910 (1911).?Conn. State Entomologist. Upt. 4:213. pests of Fruit, pp. 160-162. Plate XXVI.— Pear Tree Before (1) and After (2) Removal of Loose of bark renders tree less attractive to winter adults of pear psylla.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectagriculture, bookyear
