1010] 



ECONOMIC ZOOLOCY — ENTOMOLOGY. 



755 



years prior to 1!>17, thousands of cocoons having been collected and destroyed 

 through rewards offered to children, n Is estimated thai 20,000 viable cocoons 

 vrere destroyed during a single year. 



The bee moth or wax worm. I<\ B. PADDOCK [Terns Sin. Jlul. 231 (HUH), pp. 

 5-38).— This revision of Bulletin 158 (B. B. R., 29, p. 650) contains additional 

 Information obtained from experiments In the practical control of this pest 



in Fumigation work experiments were made with sulphur and carbon bisul- 

 phld. While sulphur dloxld is generally effective under proper co n dit ions, it 

 ran ooi i"- recommended In preference to carbon bisulphld. Experiments with 

 the infills show them to be very susceptible t<> carbon bisulphld, being overcome 

 in from i<> to US minutes and killed in from 16 to 20 minutes after being cou- 

 flned, when an average dose is used. All fumigation should he allowed to 

 continue for at least rj hours, as those larvae which are best protected by webs 

 nnd refuse will nol be killed unless plenty of time is given for the gas t<> pene- 



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Piq. 1.— Diagram of life history of the strawberry leaf roller, showing the proper times 



during the season for spraying. 



trate the material. The eggs of the bee moth are uninjured by fumes of carbon 

 bisulphld, while the larva? usually succumb to the average dose in a compara- 

 tively short time, and the pupae are unite susceptible, but a lorn: exposure is 

 necessary. A table is given showing the quantity of liquid carbon bisulphld re- 

 quired for effective fumigation of ten frame supers and hive bodies containing 

 Infested material. 



The strawberry leaf roller (Ancylis comptana), 1!. L. WebSTEB (Intra stn. 

 Bui. 1V.) {1918), w- .!33-,r,t]. flgg. 8; abridged ed. {1918), pp. -',. fiffe. 4).— This 

 tortridd is said to be the most common strawberry insect in Iowa, severe losses 

 frequently being caused by it. Reference Is made to localities in Scott County, 

 where strawberry growing was p radically abandoned due to it. The species 

 is particularly abundant and causes the most trouble in the Mississippi Valley, 

 occurring in practically every Slate between the Appalachian and Rocky Moun- 

 tains, in North America it is apparently restricted to a very few f l plants, 



the blackberry and raspberry being the only others known. 



There appear to be three generations in Iowa (fig. 1). The winter is passed as 

 nearly mature larvae. At Ames, eggs are deposited by moths of the overwintering 

 generation as early as April 28, by moths of the second generation as early as June 



