1920] ECONOMIC ZOOLOGY — ENTOMOLOGY. 759 



" The plnnt lousji' is reduced by natural faftors of control. One species of 

 parasite, tluee species of ladybird beetles, and two species of syrplud (lies were 

 observed to prey on tliis louse." 



A bibli();,'raphy of ."> paj^es is appended. 



The Kuropeaii corn borer, L. Haskman (Misxovri Sta. Circ. 9/f {l'.)20), pp. 4, 

 fig. 1). — Attention is called to tbe occurrence of Pyrauata Jitibilalis in this 

 country, with a brief account of its injury, general appearance, life history, 

 methods of control, and quarantines against it. 



The green clover worm (I*lathypena .scabra Fabr. ) as a pest on soy 

 beans, F. Shkhman (Jour. Econ. Ent., IS (1920), No. S, pp. 205-303) .—Thin is a 

 report of studies made during the course of an outbreak of P. scabra in North 

 Carolina during August, 1919. 



The tirst report of the destruction of leaves of soy beans by this pest canie to 

 the author from a farm agent of an eastern county on July 29, 1919. Following 

 that date reports of injury were received in large numbers. Within 10 days the 

 injury caused was at its height, and two weeks later it was on the decline and 

 some fields were recovering. The outbreak was universal throughout the east- 

 ern half of the State, tens of thousands of acres of soy beans being so defoliated 

 that the lacework of dried leaf veins gave a hazy, cobwebby appearance to whole 

 fields. In the most severe cases all the foliage was eaten, but normally the at- 

 tack was most severe on the younger of the grown leaves in the uitiier part of the 

 plant, leaving the growing bud and the older lower leaves. 



The author found that 51 days are required for completion of the life cycle, 

 as follows: Egg, 5 days; hatching to spinning of cocoon, 25 days; larva in co- 

 coon, 2 days ; true pupal stage, 11 daj's ; emergence to mating, 1 day ; and mating 

 to laying of eggs, 7 days. 



The egg-parasite Trichogramma pretiona was found to be the most important 

 enemy, approximately 50 per cent of the eggs being parasitized by it. The 

 tachinid Phorocera claripennis Macq. was the second in importance as a para- 

 site. Other parasites reared include Exorinta boarmiw Coq., Frontina aletice 

 Rilej', Euphorocera floridensis Tns., Anthrax lateralis Say., Sarcophaga cimbicis 

 Tns., and a campoplegine, probably representing a new genus and new species. 



In work with control measures ixjwdered arsenate of lead at the rate of 1 to 

 8 lbs. of lime was effective and safe to the plant. Its use is deemeil practicable 

 in large areas of soy beans, particularly when grown in rows. It is not too 

 costly and pays a good profit on its use, especially if applied before the injury 

 reaches its maximum. It is stated that a very careful farmer whose field was 

 under observation tried arsenate alone successfully as a test, a very light appli- 

 cation having been made. It was found that there was little danger from the 

 use of hay treated in this way, the material gradually disappearing from the 

 leaves. 



Farmers' Bulletin 982, by Hill, on this insect, particularly as an enemy of 

 alfalfa, has been noted (E. S. R., 39, p. 865). 



Green clover worm as a pest of soy beans, with special reference to the 

 outbreak in 1919, F. Sherman and R. W. Lkiby (N. C. Agr. Ext. Srrv. Circ. 

 105 (1920), pp. 1ft, figs. 5). — This is an account of Plathypcna scabra Fabr.. an 

 account of which, from another source, is noted above. 



Experiments for the control of cabbage root maggot, W. T. Macoun 

 (Canada Expt. Farms Rpt. 1919, pp. SO, Si).— Experiments conducted at the 

 Central Experimental Farm in 1918 indicate that corrosive sublimate and 

 oakum are two very promising remedies for the cabbage root maggot. The 

 corrosive sublimate was used at the rate of 1 oz. to 10 gal. of water, applied 

 four times at intervals of a week beginning immediately after the plants were 



