. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. NUMBER OF FEEDING PUNCTURES - 165,846. Pigrnre 6. Time of Occurrence of Feeding' Punctures in Apples by Over- wintering- PZum Curculio Beetles in the Insectary, Waltham, Mass. The number of feeding punctures used in this diagram is computed from a daily record of the actual nuniber of feeding punctures made by 10 beetles retained from each semi-weekly collection by jarring on the dates shown in Pigure 4. The solid areas in the diagram indicate the total percentage of feeding punctures which occurred after
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. NUMBER OF FEEDING PUNCTURES - 165,846. Pigrnre 6. Time of Occurrence of Feeding' Punctures in Apples by Over- wintering- PZum Curculio Beetles in the Insectary, Waltham, Mass. The number of feeding punctures used in this diagram is computed from a daily record of the actual nuniber of feeding punctures made by 10 beetles retained from each semi-weekly collection by jarring on the dates shown in Pigure 4. The solid areas in the diagram indicate the total percentage of feeding punctures which occurred after the last date shown in the graph. The last feeding- puncture was made on September 1 in 1926, on October 15 in 1927, and on November 17 in 1928. Time that Larvae Leave the Fruit. Figure 7 shows that larvae of the plum curculio first left the apples to enter the soil between June 25 and 30 in 1926 and 1928, and soon afterward in 1927. The greatest number of larvae left between July 10 and 20 each year, and with the exception of two individuals in 1927 all of them entered the soil before September 1. This activity has been very cbnstant during the three years of observation. A more detailed report on the emergence of larvae from dropped apples in the orchard is given in Table 12. Emergence of Beetles from Soil. Beginning the last ten daj's of July, the beetles emerge from the soil in increasing numbers until they reach a maximum between August 6 and 20. After this point the number decreases rapidly with a few stragglers con- tinuing to appear until early October, as shown in Figure 8. Emergence has been quite constant in these studies. The beetles seek their hibernating quarters between September 15 and October 1, depending on the 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 Massachusetts Agricu
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