. Bulletin of the Department of Agriculture. Agriculture. AMERICAN PLUM BOEEB. 7 Table II.—Emergence of spring brood of moths of the plum borer at Winchester, Va., in 1913. (See fig. 1.) Date of observa- tion. Number of moths emerg- ing. Date of observa- tion. Number of moths emerg- ing. Apr. 25 29 May 3 7 11 15 1 6 10 31 6 3 May 19 23 27 31 June 4 8 3 5 1 2 8 0 79 Girault, in 1905, records one adult that emerged at Washington as early as April 21 and later notes that empty pupal cases were very plentiful in the field by May 2. In normal seasons adults probably begin appearing in
. Bulletin of the Department of Agriculture. Agriculture. AMERICAN PLUM BOEEB. 7 Table II.—Emergence of spring brood of moths of the plum borer at Winchester, Va., in 1913. (See fig. 1.) Date of observa- tion. Number of moths emerg- ing. Date of observa- tion. Number of moths emerg- ing. Apr. 25 29 May 3 7 11 15 1 6 10 31 6 3 May 19 23 27 31 June 4 8 3 5 1 2 8 0 79 Girault, in 1905, records one adult that emerged at Washington as early as April 21 and later notes that empty pupal cases were very plentiful in the field by May 2. In normal seasons adults probably begin appearing in the latitude of Winchester and Washington from the last of April to the first of May. Rosenfeld, in 1906, observed emergence in Georgia as early as March 29, or about one month earlier than it occurred at Washington the preceding year. In 1913 maximum emergence occurred at Winchester on May 7, twelve days after the first moth appeared, and adults continued to emerge in the rearing cages in lessening numbers until June 4. The seasonal appearance of the moths can be more easily appreciated by reference to figure 1. 35. Fig. 1.—Diagram showing emergence of spring brood of moths of the American plum borer (Euzophcra scmifuneralis) at Winchester, Va., in 1913. (Original.) OVIPOSITION OF FIRST GENERATION OF MOTHS. As the moths emerged from day to day they were transferred to jars containing twigs of plum or apple wood, all of those issuing on the same date being confined in one jar and a record kept of the number of eggs subsequently deposited. Eggs were laid freely on the twigs, singly or in small groups in the cracks and crevices of 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 United States. Dept. of Agriculture. [Washington, D. C. ?] : The Department : Supt. of Docs. , Govt. Print. Off.
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