296 



the primary emergence, has proved useless. Asilids are effective 

 natural enemies, and a bug, Amyotea hamata, might prove useful as a 

 predator were it present in greater numbers. 



Troop (J.). Entomology. — 32nd Ann. Rept. 1918-19, Purdue Univ. 

 Agric. E.\pt. Sta., Lafavette, Ind., pp. 33-36. [Received 21st 

 April 1921.] 



The study of the life-history of Cydia [Carpocapsa) pomonella 

 (codling moth) under Indiana conditions has been continued. There 

 is apparently no maximum time of emergence, but the moths appear 

 steadily from 15th June to 15th August. During hot weather the 

 larvae may hatch in 6 to 8 days after the emergence of the adult. 

 To prevent infestation the apples should be kept covered with poisons 

 from the time the blossoms fall until the end of August. 



The wheat joint worm [Harmolita triiici] has caused even more 

 injury to wheat than Mayetiola destructor. Rotation of crops, plough- 

 ing under of stubble, etc., are measures advocated for the control of 

 this pest. Only one brood of the wheat midge [Contarinia triiici] 

 is injurious to the crop, and it may be controlled by autumn ploughing. 



Grasshoppers were successfully controlled by the use of the hopper- 

 dozer, and where this means could not be applied, poison baits were 

 used. Ground oats and barley or even sawdust proved an effective 

 substitute for wheat bran in poison baits. Army worms were more 

 abundant than usual, but were heavily parasitised and a repetition 

 of the outbreak is not expected. 



The seventeen year Cicada [Tibicen septemdecim] caused serious 

 injury to young fruit trees in sod in certain areas. 



Troop (J.). Entomology. — 33rd Ann. Rept. 1919-20, Purdue Univ. 



Agric. Expt. Sta., Lafayette, Ind., pp. 22-23, 2 figs. [Received 



2rst April 1921.] 



As a result of further investigations into the life-history of the 



codling moth [Cydia pomonella], it has been found that there are no 



well defined broods and practically no break from the time of the 



emergence of the first moths in May to the last in September. These 



data will necessitate a revision of the existing spray schedules. 



Larrimer (W. H.). The Hessian Fly in Indiana. — Purdue Univ. Agric. 



Expt. Sta., Lafavette, Ind., Circ. 95, May 1920, 8 pp., 5 figs. 



[Received 21st April 1921.] 

 The Hessian fly [Mayetiola destructor] has two generations in Indiana. 

 Its life-history in that State is described. Remedial measures include 

 the usual cultural methods, and the determination of a safe date for 

 sowing. Experiments have been conducted along these lines, and a 

 chart is given showing the dates for various districts. As these dates 

 must vary according to w^eather conditions and fly prevalence, the 

 necessary information will be given out far enough in advance for 

 farmers in the affected localities to modify their plans accordingly. 



Price (W. A.). Bees and their Relation to Arsenical Sprays at Blossom- 

 ing Time. — Purdue Univ. Agric. ExM. Sta., Lafavette, Ind., 

 Bull. 247, July 1920, 15 pp., 7 figs. [Received 21st April 1921.1 

 An almost imperceptible amount of arsenic is fatal to bees, and 



observations have shown that they will work freely on sprayed trees 



although surrounded by unsprayed ones. For these reasons fruit 



trees should not be sprayed while in full bloom. 



