. The Codling Moth . Fig. 10.—Band record made by David Brothers in Colorado in 1S99. period of the different stages is as follows: From egg to larva. 7days: from larva to cocoon stage. 19 days; from cocoon stage to emer-gence of moth. 18 days: from emergence of moth to middle of egg-. Fig. 11.—Band record published by Prof. C P. Gillette, taken on 14 trees, at Fort Collins, Colo., in 1900. laying stage. 5 day- (estimated); total, 4:9 days, or V weeks. Fromthe writers numerous records of the lengths of the different stages,however, it is found that most are somewhat longer than those given6514
. The Codling Moth . Fig. 10.—Band record made by David Brothers in Colorado in 1S99. period of the different stages is as follows: From egg to larva. 7days: from larva to cocoon stage. 19 days; from cocoon stage to emer-gence of moth. 18 days: from emergence of moth to middle of egg-. Fig. 11.—Band record published by Prof. C P. Gillette, taken on 14 trees, at Fort Collins, Colo., in 1900. laying stage. 5 day- (estimated); total, 4:9 days, or V weeks. Fromthe writers numerous records of the lengths of the different stages,however, it is found that most are somewhat longer than those given6514—No. 41—03 4 50 by Professor Gillette and thai the egg stage averages about 11 days;from th hatching of larvae to Leaving the fruit, 20 days; from enter-ing the bands to emergence of moth. 22 days; from emergence of mothto middle of egg laying (estimated). 5 days; making a total of 58 days,or about 8 weeks. By adding together the shortest times and thelongest times, respectively, we find the minimum length of the lifecycle to be 36 days and the maximum LOO days. This period of 55 to58 days having been obtained by these two widely different methods,they are probably not far from the correct average length of the lifeeycli- of the codling moth. SEASONAL HISTORY. By
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