386 



Severin (H. C). Cabbage Worms. The Imported Cabbage Worm, 

 the Cabbage Looper and the Diamond-back Moth.— So^^th Dakota 

 State Entomologist, BrooJcings, Circ. 9, November 1919, 10 pp., 



2 figs. 



A popular account is given of the life-histories and habits of and 

 methods of control for Pieris (Pontia) rapae, L. (cabbage worm), 

 Phijtometra [Autographa) brassicae, Riley (cabbage looper) and 

 Plutella, maculipermis, Curt, (diamond-back moth), all of which are 

 serious pests of vegetable crops in South Dakota. 



Sevekin (H. C). Currant and Gooseberry Worms. The Imported 

 Currant Worm and the Currant Span- Worm. — South Dakota State 

 Entomologist, Brookings, Circ. 10, November 1919, 6 pp., 3 figs. 



Pterowus ribesii. Scop, (imported currant worm) Is found in South 

 Dakota wherever currant and gooseberry plants are grown. The 

 sprays recommended for it are 1 lb. lead arsenate paste or i lb. powder 

 to 25 U.S. gals, of water, or ^ lb. Paris green and | lb. freshly slaked 

 lime to the same quantity of water. This should be apphed as soon as 

 the leaves unfold, or when larvae are first noticed. If the second 

 generation is destructive, fresh hellebore should be used in the propor- 

 tion of 1 oz. to ] U.S. gal. of water, or 1 oz. to 5 oz. air-slaked lime or 

 cheap waste flour if used as a dust. 



Ci/matophora rihearia, Fitch (currant and gooseberry span-worm) 

 also attacks the foliage of both plants and may entirely strip a bush 

 of its leaves and then attack the soft growing stem and devour it also. 

 There is one generation in a year. The eggs are glued upon the canes, 

 and do not hatch until the warm weather in the following spring, 

 generally in late May or early June. The larvae feed for 3 or 4 weeks 

 before becoming full-grown, when they enter the ground and pupate 

 at the depth of a few inches. The adult emerges 2 or 3 weeks later. 

 ■Spraying as directed for P. ribesii will kill these caterpillars, but helle- 

 bore is not effective. They may be caught by jarring the bushes, 

 when they drop and hang on a thread ; they can then be thrown into 

 kerosene. 



Mackie (D. B.). a Prepared Grasshopper Poison. — Mthlij. Bull. Cal 

 State Dept. Agric, Sacramento, ix, no. 5-6, Mav-June 1920, pp. 

 194-197. 



The season of 1919 was a particularly bad one in respect to grass- 

 hopper infestation in California, and a serious invasion is again expected 

 in 1920. The importance of being prepared with poison-baits before 

 infestation begins cannot be over-estimated. Unfortunately the 

 necessary supplies are extremely difficult to obtain and very costly, 

 and many people were prevented from taking action for these reasons. 

 Experiments were therefore undertaken with a view to devising a 

 formula that could be put in cans and kept without deterioration 

 until needed. The compound that proved most successful and econo- 

 mical consisted of 5 lb. of orange and grapefruit pulp, finely ground, 

 with 1 lb. white arsenic. When needed for use, this concentrate is diluted 

 with 4 U.S. gals, of water and mixed with 25 lb. bran. This mixture 

 was found to give as good results as freshly-mixed standard bran mash. 



