. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. PLUM CURCULIO IN APPLES 13 from May 26 to June 1. ^'ery few curculios were in the trees before this time (Fig- ure 3), and the dividing hne between eiTective and late control treatments was May 28, as is indicated by the double line in Figure 5. Figure 5.—Relation of Maximum Daily Temperatures to the Activity of the Beetles During the Critical Period for Control of the Plum CurcuHo. Waltham, Mass., 1931. ?i 24 25 26 i7 2^29 3 0^1 (234 MAY JUNE Average number of punctures per day by 10 beetles in insectary
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. PLUM CURCULIO IN APPLES 13 from May 26 to June 1. ^'ery few curculios were in the trees before this time (Fig- ure 3), and the dividing hne between eiTective and late control treatments was May 28, as is indicated by the double line in Figure 5. Figure 5.—Relation of Maximum Daily Temperatures to the Activity of the Beetles During the Critical Period for Control of the Plum CurcuHo. Waltham, Mass., 1931. ?i 24 25 26 i7 2^29 3 0^1 (234 MAY JUNE Average number of punctures per day by 10 beetles in insectary. Average maximum daily temperature in insectary. Worcester County, 1931 The 1931 records from 38 orchards in Worcester County showed 20 per cent better control in Baldwin orchards and 14 per cent better control in Mcintosh orchards where the application was made on May 26, 27 or 28 than where the sprays were applied after this date. It is interesting to note that with both vari- eties of fruit the minimum infestation in orchards receiving a late application is greater than the maximum infestation where a timely application was made. Table 8.—Percentage of Harvested Fruit Injured by Plum Curculio. Worcester County, Mass., 1931 Time of Application Infestation, Per Cent Variety Number of Orchards Maximum Minimum Average May 26, 27, 28 May 29 to June 6 / Baldwin (Mcintosh Baldwin Mcintosh 6 6 16 10 Middlesex County, 1931 Similar records from 30 orchards in Middlesex County in 1931 showed a gain of 14 per cent control in orchards sprayed on May 26, 27, or 28, compared to those receiving later applications. No distinction between varieties is made in these orchards, and there is considerable variation due, apparently, to location and inconsistent thoroughness of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance
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