42 



Station of the French Ministry of Agriculture. Up to a temperature 

 of 70° C. [159° F.] 3 hours treatment does not impair the vitaUty of 

 the seed. At 75° C. [168° F.] 2 hours exposure either kills the seed or 

 makes the plants weakly. A temperature of 60° C. [140° F.] seems 

 ample for the purpose of destroying all animal pests, and can safely 

 be used. 



As onl}' a small quantity of seedjs required for planting, the author 

 suggests that disinfection can be effected by mixing the seed with sand 

 or sawdust that has been heated to 60° C. in a big pan. A few pre- 

 liminary tests will show what quantity of sand or sawdust is needed 

 for the purpose of maintaining the mass at 60° C. [140° F.] for at least 

 1-2 hours. 



CiMATTi (V.). I Nemici del Frumento. [Wheat Pests.] — Riv. Agric, 

 Parma, xxvi, nos. 39, 43, 45, 46, 47 ; 2v3rd September, 22nd October, 

 5th, 12th, 19th November 1920 ; pp. 484-486, 536-537, 557-559, 

 571, 586-587; 9 figs. 



In view of the urgent need for increased agricultural production in 

 Italy, losses due to animal pests, especially insects, are doubly severe. 

 These popular articles are intended to make known the insect pests of 

 wheat ; they contain no new information. 



Froggatt {W. W.). Insects found on Tobacco in New South Wales. — 



Agric. Gaz. N.S.W., Sydney, xxi, pt. 10, October 1920, pp. 714-716, 

 3 plates. 



The insects here described were obser\'ed on tobacco during an 

 investigation of damage caused by thrips. Phthorimaea operculella, 

 which is normally a potato pest, also attacks tomato and tobacco. 

 It is consequently not advisable to grow and keep bagged potatoes in 

 the vicinity of t(jbacco fields, and all rejected and waste tobacco 

 plants, potato stalks and tomato vines should be regularly cleaned up 

 and burnt. The moths emerging from the drying tobacco stalks w^ould 

 then have little suitable food upon which to oviposit. 



Nysitis viniior (Rutherglen bug) might become dangerous to tobacco 

 under favourable chmatic conditions. Any waste land or rubbish 

 near the fields should be burnt over as soon as the insect is observed. 

 The green leaf Jassid was numerous, as were two small green plant- 

 bugs, Dicyphiis tabaci, sp. n., and another unidentified species of the 

 same genus. 



Lewis (A. C.) & McLendox (C. A.). Cotton Variety Tests 1919.-— 



Georgia State Bd. Entom., Atlanta, Circ. 29, January 1920, 9 pp. 

 [Received 25th November 1920.] 



The results of a series of cotton variety tests are here summarised, 

 and from them are drawn recommendations as to the \'arieties of cotton 

 that can be most successfully grown under present boll wee\'il and 

 disease conditions in Georgia. 



The ideal cotton plant to grow when the cotton boll weevil \Antho- 

 nomus grandis] is present should begin fruiting close to the ground 

 early in the season, and have long fruiting branches at the base that 

 continue to grow throughout the season. The fruiting spurs of the 

 cluster and the short fruiting branches of the semi-cluster types of 

 cotton do not continue to grow throughout the season. Under boll 

 weevil conditions the more cotton that is produced on the lower half 

 of the plant, the larger will be the yield per acre. 



