308 



principally by the wind, a most careful examination of wind-swept 

 areas is necessary, special attention being given to oak and apple trees, 

 which are the favourite food-plants. Early in May the bark of trees 

 in and near infested localities may be scraped, provided that the 

 inner bark and the cambium are not injured, and bands of tree-tangle- 

 foot applied to prevent the young caterpillars from crawling up. 

 During June, if the infestation is severe, the young caterpillars may 

 be destroyed by spraying with lead arsenate, 6 lb. in 50 U.S. gals, 

 water. 



This report gives details of the above control measures in 21 towns 

 with a table of statistics of infestations. Measures to control the 

 brown-tail moth [Ewproctis chrysorrhoea) are also recorded, an agent 

 assisted by trained local men having destroyed 14,450 webs in four 

 towns. If the infestations should increase, the establishment of a 

 parasite laboratory would probably be advisable. 



Britton (W. E.). a Destructive Aphid on Turnips, Aphis jpseudo- 

 brassicae, Davis. — 16th Rept. State Entomologist of Connecticut for 

 the Year 1916, Conn. Agric. Exp. Sta., New Haven, 1917, pp. 98- 

 104, 1 fig., 3 plates. [Received 17th May 1917.] 



Aphis pseudobrassicae is widely distributed throughout the United 

 States and is most injurious, completely killing the plants attacked 

 within a few days. It is found on turnip, radish, cabbage, cauliflower, 

 kale, rape, kohl-rabi, rutabaga or Swedish turnip, mustard, lettuce 

 and bean. The fact that it is not found on these cultivated host-plants 

 for four or five months in the year suggests that there is an alternative 

 host, though this has not been identified. In Connecticut natural 

 checks include the Coccinellids, Coccinella novemnotata, Hbst., and 

 C. transversoguttata, F., which are abundant in both the lan^al and 

 adult stages. This Aphid is also attacked by the fungus, Enlo- 

 mophthora aphidis, Hoff. In Texas Aphis pseudobrassicae is heavily 

 parasitised by the Hymenoptera, Diaeretus rapae, Curt., and 

 Lysiphlebiis testac^ip)es, Cress. 



These natural controls cannot, however, be depended on to save 

 the crops, as they appear too late ; reliance must therefore be placed 

 on the destruction of young colonies by spraying the under 

 leaf-surfaces with a solution of common laundry soap, 1 lb. in 7 U.S. 

 gals, of water. 



Britton (W. E.). The Control of Aphids in Fields of Seed Beets. — 

 16th Rept. State Entomologist of Connecticut for the Year 1916, Conn. 

 Agric. Expt. Sta., New Haven, 1917, pp. 104-105. [Received 

 17th May 1917.] 



Three species, Apihis rumicis, L., Macrosiphum solanifolii, Ashm., 

 and Myzus persicae, SuLz.. are recorded on seed-beets, especially on 

 those plants round the edges of fields. The experimental treatment 

 consisted in carefully spraying the infested part of each plant with 

 Black-leaf 40, 1 teaspoonful in 1 U.S. gal. of water with a little soap 

 added, and an examination of the plants a week or two later showed 

 that it had been, on the whole, effective. 



