310 



Sodium cyanide is probably too poisonous for general use, but the 

 results obtained may give some guidance for the use of other substances, 

 such as paradichlorobenzene. 



Sanders (J. G.) & De Long (D. M.). Dust versus Spray for Control 

 of Sour Cherry Pests in Pennsylvania. — Jl. Econ. Entom., Concord, 

 N.H., xiii, no. 2, April 1920, pp. 208-210. 



The usual pests of sour cherry in Pennsylvania, curculio [Cono- 

 trachelus nenuphar], slug [Eriocmnpoides limacina] and leaf spot 

 disease, were unusually destructive in 1918, and as a consequence a 

 series of experiments were carried out in 1919 to determine the relative 

 value of dust and spray mixtures. 



The following were the materials used and the proportions of the 

 ingredients : — Sulphur-lead-arsenate dust 90-10 ; lime-sulphur spray 

 1-40 ; lime-sulphur-lead-arsenate dust 50-45-5 ; and Bordeaux spray 

 3-3-50 to 1 lb. lead arsenate. In apphcation the dust had several 

 advantages over the spray. It could be apphed in less than half the 

 time with less labour, and the only disadvantage is that undesirable 

 wind conditions cause delay. All the four apphcations produced 

 excellent results as compared with the control plot, but the sulphur- 

 lead-arsenate dust seemed the best in results as well as in the ease of 

 apphcation. These experiments are to be continued in 1920. 



Fernald (H. T.). Ten Years of the Oriental Moth. — Jl. Econ. Entom., 

 Concord, N.H.. xiii, no. 2, April 1920, pp. 210-212. 



In 1907 the area in Massachusetts occupied by the Oriental moth 

 [Cnidocampaflavescens] was two miles by a mile and a half at the most, 

 Extending furthest from the centre towards the south-west. By 

 the end of 1916 the area occupied was four miles long by three wide 

 at the widest point and with an average wddth of two miles. The 

 insect had reached the ocean on the east, and had extended furthest to 

 the south and south-east, hardly at all to the west. In 1917 and 1918 

 shipments of a Chrysid parasite of this moth were made from China, 

 and in March 1919 about six per cent, of the cocoons were found to be 

 parasitised. 



This parasite, Chrysis shanghaiensis, infests the pupa, and un- 

 fortunately tends to emerge too soon, when the larva of its host is only 

 half-grown, and by the time that pupation occurs the weather is often 

 so cold that the parasite becomes sluggish. Attempts are to be made 

 to hold back the emergence of the parasite by cold storage. Though 

 this seems to be the only example of a Chrysid parasitic on a Lepidop- 

 teron, there is no evidence to support the theory that it is merely a 

 hyperparasite. 



Crosby (C. R.) & Palmer (R. G.). The Organisation of a Special 

 Spray Service in New York State. — Jl. Econ. Entom., Concord, 

 N.H., xiii, no. 2, April 1920, pp. 212-218. 



Control demonstrations are most effective when based on a seasonal 

 programme of treatment rather than on the use of any particular spray 

 or the destruction of any particular pest. The value of such a pro- 

 gramme is shown as adapted to local conditions and the prevalent 



