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in water to form a thin paste ; this is diluted, and the solution is poured 

 into the sprayer and the soap solution then added. The sprayer 

 must be worked at a uniform pressure, and its contents must be 

 continuously stirred. Any sediment remaining in it must not be 

 emptied on to the seed-beds. 



LuiGioxi (P.). Coleotteri esotici utili e dannosi alle Piante importati 

 in Italia e rinvenuti nel Lazio. [Exotic Coleoptera, beneficial and 

 injurious to Plants, introduced into Italy and found in the 

 Province of Rome.] — Atti Pontificia Acad. Niiovi Lincei, Rome, 

 Sess. I, 19th December 1920. Separate, 4 pp. [Received 

 10th April 1921.] 



The beetles mentioned are a Coccinellid, Rhizohius lophantae, 

 Blaisd., imported against the scales, Aulacaspis pentagona and 

 Chrysomphahts anrantii ; a Curculionid, Paiiiouioriis fidleri, Horn, 

 probably imported on some exotic plant and reported from various 

 parts of Italy and in 1908 from Sicily, in which citrus-growing region 

 it is hoped that it has not become established ; a Bruchid, Sper- 

 mophagiis snhfasciatus, Boh., evidently introduced in beans imported 

 from Brazil during the War ; and a Scolytid, Coccotrypes dacty- 

 liperda, F. The author has also found the last-named in nuts of 

 Hvphaene thebaica (dum palm) from Eritrea, the solid kernel being so 

 damaged as to be useless for vegetable ivor3\ 



Morrill (A. W.). The Use of Corn as a Trap Crop for the Cotton 

 Bollworm. — Univ. Ariz. Coll. Agric, Tucson, Circ. 30, March 

 1920, 10 pp., 2 figs. [Received 7th April 1921.] 



The value of maize as a trap crop for the cotton bollworm [Heliotliis 

 ■ohsoleta] has long been known in Texas and the south-eastern cotton- 

 growing States, and the object of this circular is to bring information 

 on this method before the cotton growers of Arizona, with particular 

 reference to conditions existing in that State. Much of the general 

 information is taken from bulletins issued by the United States 

 Department of Agriculture and previously noticed in this Review. 

 As the female moths are attracted to fresh maize-silk rather than to 

 any other material for oviposition, it is generally considered necessary 

 to plant the trap maize so that it will reach the silking stage when 

 the cotton is most in need of protection, though there is evidence that 

 maize maturing at any time during the fruiting season of cotton may 

 protect cotton growing in the immediate vicinity. This is a matter 

 that requires further observation under Arizona conditions, particularly 

 with Egvptian cotton, but from present observation it seems that maize 

 in silk during June and July in Arizona is not likely to do any harm 

 and may be a great benefit to the cotton crop in a neighbouring field. 

 ]\Iuch valuable information can be gained by noting the amount of 

 bollworm damage close to infested maize in comparison with the 

 damage in the fields furthest from it. A count should also be made of 

 the average number of eggs on the silk of young maize ears. Various 

 observations on the value of maize as a trap crop are recorded, and 

 recommendations for its use are quoted from a bulletin of the United 

 States Department of x\griculture, with suggested adaptations to 

 Arizona conditions. 



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