208 



Becker (G. G.). The Control of the Round-headed Apple Tree Borer. 

 — Jl. Econ. Entom., Concord, N.H., x, no. 1, February 1917, 

 pp. 66-71. 



Experiments in control of this borer [Saperda Candida] have led to 

 the conclusion that white lead is impracticable for this purpose, as 

 trees have to be treated again each year, while the protection obtained 

 is not commensurate with the cost. Paper wrappers and tree veneers 

 may be dangerous, as they harbour other insect pests, while their 

 xenewal and readjustment each year may render their use too costly. 

 The cost of screening is also prohibitive, while the danger from girdling 

 is a factor against its use. Asphaltum has been found to injure the 

 tree to such an extent as to render its use too risky. The most prac- 

 ticable and the cheapest method of controlling this borer has proved 

 to be the destruction of the individual larvae in the trees during 

 August and early September. 



Metcalf (Z. p.). Lime as an Insecticide. — Jl. Econ. Entom., 

 Concord, N.H., x, no. 1, February 1917, pp. 74-78. 2 plates. 



Id experiments for the control of Bruchiis chinensis, L.» and B. quadri- 

 maculatus, F., (cow-pea weevils), in peas stored for seed, fumigation 

 with carbon bisulphide was found to have no influence on the breeding 

 of the weevils. Kerosene, crude carbolic acid and air-slaked 

 lime were then tried, the last-named giving decidedly the best 

 Tesults. A series of experiments was then carried out in which peas 

 were treated with varying proportions of air-slaked lime, ranging from 

 4 parts lime to 1 part peas to 1 part lime to 11 parts peas. A table 

 is given detailing the results of these experiments. Taking into 

 consideration the results of germination tests and also the proportion 

 of emergence holes in the treated peas, the conclusion reached is that 

 peas should be stored in air-slaked lime at the rate of one part lime to 

 two parts peas by weight, though it is hoped that a cheaper and simpler 

 method may be devised. 



Pabrott (P. J.). The Radish Maggot and Screening. — Jl. Econ. Entom., 

 Concord, N.H., x, no. 1, February 1917, pp. 79-81. 



Experiments on growing radishes under cheese-cloth as a protection 

 from root maggots and flea-beetles are described. As soon as planting 

 is completed, the frames are placed in position and the cheesecloth 

 attached, the plants being thinned and weeded when the first pair of 

 true leaves appear. A table giving the results of these experiments 

 demonstrates that plants thus screened show a larger proportion of 

 marketable roots. 



Hewitt (C. G.). Insect Behaviour as a Factor in Applied Entomology. 



— Jl. Econ. Entom., Concord, N.H., x, no. 1, February 1917, 

 pp. 81-94. 



Insect behaviour constitutes the basis of applied entomology — a 

 fact which cannot be too generally realised nor too constantly borne 

 in mind. Early investigations by entomologists were limited to the 

 study of the life-histories of insects, control measures being based on 

 this knowledge, supplemented by a limited study of the insects' habits. 



