45 



Peterson (A.). Peach Tree Borer. Some Experiments on the Adults 

 and Eggs and other Notes. — Rept. Dept. Entom. J917, New Jersey 

 Agric. Expt. Sta., New Brunswick, N. J., 1918, pp. 449-463, 1 plate. 

 [Received 2nd December 1919.] 



Observations are recorded on the peach-tree borer [Aegeria exitiosa] 

 during the summer of 1917, a series of experiments having been con- 

 ducted under two large screen cages in a severely infested orchard. 

 As the adult moths were never seen to feed or to show any desire for 

 food, the use of poison -baits or sprays against this stage is evidently 

 useless. The results of the experiments were largely negative as far 

 as remedial measures are concerned. Certain chemicals had a 

 partially repellent effect on the female while ovipositing, and certain 

 sprays resulted in partial destruction of the eggs. Various chemical and 

 mechanical tree protectors are now being tested, but their value is not 

 yet determined. In the author's opinion the question of controlling 

 A. exitiosa will be solved by a mechanical or chemical barrier that 

 will kill the larva or otherwise prevent it from entering the tree. 

 It is not considered advisable to attempt to kill the larva once it has 

 done so. 



Peterson (A.). Soil-infesting Insect Investigations. — Rejyt. Depf. 

 Entom. 1917, Neiv Jersey Agric. Expt. Sta., New Brunswick, N, J., 

 1918, pp. 469-479. [Received 2nd December 1919.] 



Laboratory and field experiments with sodium cyanide and other 

 chemicals such as lime-sulphur, sodium sulphocarbonate, pyridine 

 and a commercial product known as carbol-sul, which is composed of 

 40 per cent, to 50 per cent, carbon bisulphide, have shown that wire- 

 worms in the soil can be killed with large quantities of sodium cyanide, 

 but the amount necessary to ensure efficient control renders the treat- 

 ment too expensive for ordinary use in the field. A system of crop 

 rotation designed to meet the problem of wireworm control has been 

 worked out and will be tested during the coming season. 



Peterson (A.). Some Studies on the Eggs of Important Apple Plant 

 Lice. — New Jersey Agric. Expt. Sta., New Brunswick, Bull. 332, 

 [n.d.] 63 pp., 2 plates. [Received 2nd December 1919.] 



Recent investigations on the structure, behaviour and susceptibility 

 of the eggs of Aphis avenae, ¥., A. pomi, DeG., and A. sorhi, Kalt., 

 in connexion with the results obtained in 1916-17 [R.A.E.,k,Vi,\10] 

 are discussed. A morphological study of the eggs of three apple 

 Aphids, A. avenae, A. pomi and A. sorhi, shows the presence of two 

 distinct layers in the egg-shell, an outer semi-transparent one that is 

 soft and glutinous when the egg is deposited, but hardens and becomes 

 somewhat tough and impervious upon long exposure to weather, and 

 an inner soft, elastic, membranous, black layer. A third layer, thin 

 and membranous, may be seen about the nymph when it starts to 

 .emerge. __This skin is probably the first exuvium, since it is shed by 



