21 



twice just before the squares are large enough to be punctured. While 

 they are being attacked, two or three dustings should be given at 

 intervals of 3 or 4 days until the weevils are under control. The 

 applications should then be discontinued until infestation begins 

 again. From 5-7 lb. of dust should be used per acre each time. 

 Considerably better results were obtained by dusting while the dew 

 was on the plants. The calcium arsenate used should be of standard 

 composition [R.A.E., A, x, 19]. 



It was impossible in 1920 to estimate accurately the profits gamed 

 by dusting ; it is considered that a gain of 100 lb. of seed cotton 

 will pay the cost of poisoning, and the average gains were considerably 

 above this. A limited number of tests were made to determine 

 whether dusting would be profitable while the plants are very small 

 and the weevils that have survived the winter are feeding on the 

 buds, and these tests will be continued. 



Sanders (G. E.). Spraying and Dusting.— 57^A Ann. Kept., Nova 



Scotia Fndt Groivcvs' Assoc, Kingston, 1921, pp. 66-92. 



The main points of this address and discussion on spraying and 



dusting have already been noticed [R. A.E., A, ix, 228, 319]. Suitable 



spray and dust calendars for the Nova Scotia apple orchards are given. 



Brittain (W. H.). a New Alien Enemy.— 57th Ami. Rept., Nova 

 Scotia' Fruit Growers' Assoc, Kingston, 1921, pp. 142-148. 

 An account is given of Psylla mali, Schmidb. (apple-sucker), which 

 has recently appeared in Nova Scotia, with suggestions for its control 

 [R. A.E., A, vii, 506 ; ix, 385]. In some of the most heavily infested 

 orchards 'the insect has been almost entirely exterminated by a 

 fungous disease ; this, however, can only develop where the Psylhd 

 is very numerous, and does not seem suitable for artificial 

 distribution. 



DuDiEY (F. H.). Dusting the OTchavA.— Qtrly. Bull., Maine Dept. 

 Agric, Augusta, xix, no. 3, September 1920, 31 pp., 6 figs. 

 [Received 8th November 1921.] 



The situation is discussed with regard to dusting in Maine orchards, 

 where, on the whole, the practice is growing. Several fruit growers 

 contribute their experiences with dust sprays, and a spray calendar 

 is included. 



Notes are given on Pyrausta mtbilalis (European corn borer), 

 Papaipema nebris [nitela) (common corn borer), Heliothis ohsoleta 

 (corn ear worm), and Elaterids (wire worms) with brief instructions for 

 remedial measures. 



KxAPP (A. W.). Insect Pests in the Cocoa Store.— S////. Imp. Inst., 

 London, xix, no. 2, 1921, pp. 189-200, 1 plate. 

 The insect pests likely to be found in stored cacao are Ephestia 

 cautella, Wlk., E. elutella, Hb., E. figulilella, Gregs., Araecerus 

 fasciculatus, DeG., Ptinns tectus, Boield., P. fur, L., and Necrobta 

 rufipes, DeG. The methods of infestation and its possible prevention, 

 as well as the destruction of adults and larvae in the store by means 

 of cleanliness, ventilation, temperature, insecticides and fumigants, 

 are outlined. 



