523 



different degrees of humidity. They will be exposed in October to 

 moist conditions, when the effect of the differential treatment as 

 regards moisture will be evident. 



After an interval of four years, a campaign was conducted against 

 this pest at Mokameh with Andres-Maire traps [R.A.E .,A, i, 507; 

 iii, 320, etc.]. 



HoND.\ (H.). Spermatogenesis of Aphids, the Fate of the smaller 

 secondary Spermatocyte. — Biol. Bull. Marine Biol. Lab. Woods 

 Hole, Mass., Lancaster, Pa., xl, no. 6, June 1921, pp. 349-368. 

 4 plates. 

 The contents of this paper are indicated by its title. 



Headlee (T. J.) . Report of the Department o£ Entomology, 1917-18.— 



Rept. New Jersey Agric. Expt. Sta., 1917-18, New Bnmswick, 

 N.J., 1919, pp. 20a-243, 6 tables. [Received 6th September 

 1921.] 



Aphids were very abundant in orchards and on vegetables during 

 the year under review, as the weather conditions were unsuitable for 

 parasites. Potatoes and tomatos were considerably damaged by the 

 iiea-beetles, Epitrix ciicumeris, Harr., and E.fiiscida, Cr. Some injury 

 can be prevented by thorough applications of Bordeaux mixture, also 

 by maintained applications of lead arsenate and sulphur dust, 1 : 5. 



Investigations have been begun on Cydia [Laspeyresia) molesta 

 (Oriental peach moth), which is spreading and may cause serious 

 damage. 



Experiments w^ere carried out on the horse-radish flea-beetle {Phyllo- 

 treta armoraciae, F.), which emerges in the spring and consumes the 

 young shoots. Many were killed by scattering the fields with sliced 

 pieces of horse-radish root treated with Paris green and suspended 

 in water. The growing tips were coated with sulphur, with lead 

 arsenate and sulphur (1:5), and with hydrated lime, the last two being 

 the more effective. 



The measures recommended for the pear psylla {Psylla pyricola) in 

 1916, and their result in 1917, have already been noticed [R.A.E., 

 A, V, 321 ; viii, 44]. The three treatments used in 1916 are all 

 important, and if the pest is serious, none should be omitted. Scraping 

 is the least important. Reasonable control may be obtained by 

 regular annual winter and spring spraying with sufficient scraping 

 to keep the trees clean. A thorough coating of spray at the proper 

 time of application is essential. 



The failure to control the plum curculio ( Conotrachelus nenuphar) in 

 1917 resulted in amending the spray schedule as follows. The first 

 spray should be applied before the buds swell. If Aphid eggs are 

 present on the trees, the treatment should be delayed until the buds 

 show green. The second spray should be applied when the blossoms 

 first show colour ; the third directly after the petals fall ; the fourth 

 seven days after the petals fall and repeated 17 days later; the last 

 spray between 20th-30th June for all autumn and winter varieties 

 of plums. Thorough applications, keeping the fruit and foliage well 

 coated, are essential. Better results are obtained with a mixture of 

 lime-sulphur and lead arsenate than with the latter alone. 



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