For the past twenty-five years the problem of control of red scale, Aonidiella aurantii (Mask.) on citrus, particularly lemons, in California has been an increasingly difficult one. A major factor in this has, of couse, been the appearance and spread of the resistant strain of this insect, which now infests a considerable acreage in the State, generally the foothill districts of Los Angeles, Riverside, San Bernardino and Orange counties (Quayle 1938). Further factors influencing the increased severity of this problem are higher standards in packed fruit than formerly and lower incomes from fruit produced, causing lessened expenditures for control of the scale, which in turn results in heavier infestations. Continued research over this entire period since resistant red scale was first recognized greatly increased in the past decade, failed to solve the problem. In spite of all attempts to find more efficient insecticides, fumigation with hydrocyanic acid still remains the most satisfactory method of control of red scale.
Document Type: Research Article
Publication date: December 1, 1940
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