350 



Bogdanov-Katkov (N. N.). BaSanyxa, Phaedon cochleariae, F. — 

 TocyAapCTBeHHOe MSAaie/lbCTBO [Government Publication], 

 Pdcrsbuyg. 1921, 20 pp., 19 figs. [Received 13th May 1921.] 



Great damage is caused annually to cruciferous crops in the 

 Petersburg district by Phaedon cochleariae, F. The various stages 

 are described. Hibernation occurs in the adult stage in the ground. 

 P. armoraciae, L., is another flea-beetle often found associated with 

 it, but is of no great economic importance to crucifers in this district. 

 Towards the end of June and beginning of July the adults of P. 

 cochleariae are very numerous, and oviposition takes place. As many 

 as 400 or more eggs may be laid by a single female, and they are 

 inserted into the leaves. Eggs of the second generation are laid in 

 August. They hatch in from 8 to 12 days, the first moult occurring 

 in from 3 to 6 days and the second on the 12th day. On about the 

 17th day the larvae enter the ground, and on the 23rd day, prior to 

 pupation, they moult for the third and last time. 



Pupation lasts from 8 to 10 days. The average length of life from 

 egg to adult is from 33 to 37 days. The only parasites recorded are 

 a Tachinid fly, Meigenia sp., and a fungus. 



Remedial measures include cultural methods, collection of adults 

 by shaking them off the plants into a receiver, and spraying with 

 Paris green or lead arsenate. Barium chloride has not given good 

 results owing to the great humidity during the summer months. The 

 inethod of preparing and applying the spraj's is described, and spray 

 machinery is illustrated. 



Dallas (W. K.). Control of Red Mite on Fruit Trees : Further Tests 

 at Papanui Experimental Orchard.^ .V. Z. J I. Agric, Wellington, 

 xxii, no. 3, 21st March 1921, pp 171-174. 



Further experiments at Christchurch against red-mite [Tetranychus 

 sp.] on apple and plum trees confirm the results obtained in the previous 

 season [R.A.E., A, viii, 324], namely, that lime-sulphur is effective 

 against the adults, especially where trees have received an oil spray 

 in the dormant period, but not against the eggs. 



Caustic soda (1-10), as a dormant spray, destroyed mussel scale 

 [Lepidosophes ulmi], but was also ineffective against the eggs of the 

 red mite. 



BiLSiNG (S. W.). The Pecan Nut Case-bearer ( Acrobasis caryaevorella). 

 —Jl. Econ. But., Concord. N.H., xiv, no. 2, April 1921, pp. 

 149-153. 



Acrobasis caryaevorella (pecan nut case-bearer) is the most important 

 enemy of the pecan nut industry in Texas, and caused almost a com- 

 plete failure of the crop in 1920. There are three generations of this 

 moth in the year. The greatest injury is caused by the larvae of the 

 first generation, although occasionally damage by the second may be 

 serious. Hibernation occurs in the larval stage in the burrow at the 

 base of the buds. The larvae become active about the time the buds 

 start in the spring, and the adults emerge over a period of about 20 

 days, beginning at the latter part of April. Eggs are laid about three 

 to nine days later in the centre of the pistil of the nut and hatch in 

 about five days. For the first few days the larvae attack the buds 

 below the nut cluster, after which they bore into the nuts at the base. 



