510 



kerosene in water have proved efficacious ; and the orange caterpillar, 

 Papilio tlioas thoantiades, Burm., for which a spraj^ containing Paris 

 green is advocated. The preparation and application of these remedies 

 are described. 



BisBY (G. R.) & ToLA.\s (A. G.). The Use of Bordeaux Mixture for 

 Sprajring Potatoes. — Minnesota Agric. Expt. Sia., Univ. Farm, 

 St. Paul, BuU. 192, June 1920, 32 pp., 4 ligs. [Received 9th 

 August 1922.] 



In discussing the effect of Bordeaux mixture for the control of 

 various fungous and insect pests of potatoes, it is stated that it has 

 a repellent effect on the leafhoppers that cause tipbum [Empoasca 

 mali] ; it does not seem to kill them, but thev go for preference to 

 unsprayed plants [R.A.E., A, \i, 489 ; vii, 278 ) ix, 31, etc.]. 



Chapman (R. X.). Insects infesting Stored Food Products. — Minnesota 

 Agric. Expt. Sta., Univ. Farm, St. Paul, Bull. 198, December 

 1921, 76 pp., 27 figs. [Received 9th August 1922.] 



This popular accoimt of the insects infesting stored food products 

 is divided into sections containing the information most useful to 

 seedsmen, grain dealers, millers, managers of warehouses, bakers, 

 householders, etc. An illustrated table is given for determining the 

 species of insect concerned, and notes are given on the life-history, 

 habits and economic importance of each, with instructions in general 

 remedial measures, such as heat, fumigation, and the best methods of 

 storing cereal products. 



Flebut (A. J.). U.S. Bur. Ent. The Grape Mealybug.— M^A/j/. Btdl. 

 Cat. State Dept. Agric, Sacramento, xi, no. 7, July 1922, pp. 6-11. 



The question of remedial measures against the grape mealybug 

 [Pseiidococcus hakeri, Essig] is a difficult one. Fumigation has so far 

 given unsatisfactory results [R.A.E., A, ix. 111 ; x, 315], and the 

 only practicable remedy is spra^dng, though this cannot be entirely 

 efficacious owing to the nature of the injury by this pest and to the 

 fact that a few insects missed by the spraj^ are sufficient to cause 

 considerable loss to the crop. The results of sprajdng depend more 

 upon care of application than upon the materials used. Almost any 

 miscible oil gives good results if carefully applied. The most successful 

 treatment seems to be a dormant spray of 24-28° Be. oil applied 

 with a spray gun. This appeared to give 83 to 89 per cent, m.ortality. 

 It was foUowed by a delayed dormant spray after the buds opened 

 with oil of 34-38° Be., which gave 88 to 93 per cent, mortality. 

 Unfortunately frosts during the first test and the activities of Pseiida- 

 phyciis notativentris in destroying numbers of the mealybugs during 

 the second rather interfered mth the accuracy of the counts. In 

 some cases, cresol soap was added to the spray to increase the 

 penetration. 



Although sodium cyanide fumigation in general gave unsatisfactory 

 results, the use of 1-U oz. in hquid form cleaned the trees in the 

 latter part of February when all the eggs had hatched and practically 

 all the larvae were on the arms and spurs. This result is not entirely 

 conclusive, for no insects were found even on the control trees at 

 picking time, but it is considered to warrant further investigation. 



