113 



Egyptian conditions the best method consists of driving the locusts 

 into small trenches and burying them. Contact insecticides are 

 useful, but are not as effective as the above method. Control by means 

 of Coccobacillus acridiorum and internal poisons is of little avail in this 

 climate. As no locust swarms arrived at maturity in Egypt, the 

 damage done was very small. Where it was appreciable, it was usually 

 due to indifference or negligence on the part of the owners, and it has 

 been found that Government supervision is absolutely necessary for the 

 control of locusts. 



The total cost of the campaign was about £17,000, and in spite of the 

 fact that the locusts appeared in practically every part of Egypt, the 

 cotton crop, although in great danger, was almost entirely saved. 



The appendices deal with the ministerial orders relating to the 

 destruction of locusts, the quantities of locusts and egg-masses collected 

 from the various areas up to the end of the campaign, and some 

 reprints from former papers on this subject. 



Les Essais de traitements centre la Cochylis en Suisse. [Experimental 

 Treatments against Clysia ambigueUa in Switzerland.] — La Vie 

 Agricole et Rurale, Paris, vi, no. 52, 23rd December 1916, p. 470. 



The results of experiments carried out at the Lausanne Station show 

 that solutions of titrated nicotine and concentrated tobacco juice are 

 effective if carried out at the right moment, that is, a few days after the 

 full flight of the moths. This is about three weeks after the appearance 

 of the first moths. 



Another solution that has given excellent results is based on black 

 soap and pyrethrum powder. 



SiEGLER (E. H.) A Codling Moth Trap. — Jl. Econ. Entom., Concord, 

 N.H., ix, no. 6, December 1916, pp. 517-521, 1 plate. 



In the Grand Valley of Colorado, spraying has proved quite in- 

 effectual as the sole means of controlling Cydia {Carpocapsa) pomonella, 

 L., and has also become too expensive to compensate for the benefits 

 derived from it. The more successful growers resort to a combination 

 of spraying and banding ; the need for banding is shown by an 

 example of twenty banded trees which yielded over 4,000 larvae- after 

 having been sprayed eight times. The objection to banding is the 

 labour and expense involved in gathering the larvae about eight times 

 each season. The author has therefore devised a trap which will 

 probably last two or three years, costs about Id. per trap, and requires 

 attention only at the beginning of each year. This is composed of 

 a twelve-mesh ware-screen cloth six inches wide and long enough to 

 encircle the tree. The edges are crimped in order to fit closely to the 

 tree, without tearing, when attached. The trunlc is first banded with 

 burlap about 2 inches wide and the wire-screen tacked round over the 

 band. No moths can escape the mesh and it has been found that the 

 larvae readily enter the trap. Throughout the season, the emergence 

 of the moths in the traps will serve as a guide for timing the spray 

 applications. It is hoped that the pest may be effectively controlled 

 by thorough and timely spraying, supplemented by the use of this 

 trap. 



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