267 



hibernation takes place in the larval stage in the trunk or roots. 

 Apricot, apple and cherry are also attacked by this species. Oecanthus 

 niveus, de Geer (snowy tree cricket) may cause damage to prune 

 orchards in southern Idaho. Arsenical sprays will aid in controlling 

 this species. Cicada tibicen often occurs in orchards which are situated 

 near large bodies of timber. Ceresa buhalus, F. (buffalo tree-hopper) 

 is common in southern Idaho, and in the north has recently injured 

 young trees. It can be controlled by the destruction of twigs con- 

 taining eggs and by clean cultivation. Empoasca mali, le B. (apple 

 leaf-hopper) is common on young apple trees throughout the State; 

 kerosene emulsion or Black Leaf 40 are effective sprays against this 

 insect. 



The most important garden pests are Leptinotarsa 10-Uneata, Say 

 (Colorado potato beetle), Epitrix cucumeris, Harris (potato flea-beetle), 

 Pier is (Pontia) rapae, L. (cabbage worm), Aphis brassicae, L. (cabbage 

 aphis), Protoparce (Phlegethontius) sexta, Joh. (tomato worm), cut- 

 worms, Bmchus pisorum, L. (pea weevil), Aphis gossypii, Glover 

 (melon aphis), Chloridea (Heliothis) obsoleta, F. (corn-ear worm), 

 Thrips tabaci, Lind. (onion thrips), and Chortophila {Phorbia) rubivora, 

 Coq. (raspberry cane maggot). 



Formulae for the preparation of the more common spraying materials 

 are given. 



Howe (R. W.). Studies of the Mexican Cotton Boll Weevil in the 

 Mississippi Valley. — U.S. Dept. Agric, Washington, B.C., Bull, 

 no. 358, 12th April 1916, 32 pp., 2 figs. 



Numerous observations have shown that the complete data secured 

 shortly after 1892 on the biology of Anthonomus grandis, Boh. (Mexican 

 cotton-boll weevil) need revision. Under new cUmatic and other 

 environmental conditions to which the weevil has been subjected in 

 the course of its spread, changes have been taking place in its life- 

 history. A new variety, A. grandis thurberiae, Pierce, has also been 

 recorded since that date. Many studies of this pest have therefore 

 been repeated under both the old and new conditions [see this Review, 

 Ser. A, ii, pp. 272, 582; iii, p. 545; iv, p. 125]. 



The information given in the present paper is chiefly presented in a 

 series of twenty-five tables. In northern Louisiana the average 

 longevity of A. grandis adults on cotton squares was 54*56 days ; on 

 bolls, 31-41 days ; on cotton leaves, 8*17; and on okra fruit 5*4. The 

 longevity of the variety thurberiae is greater in every instance, the 

 corresponding figures being 61*4, 48-6, 62*04 and 18*3 In A. grandis 

 the females exceeded the males on every food except cotton squares, 

 and were also markedly more prolific than those of the var. thurberiae, 

 in which the males were longer hved. The average total develop- 

 mental period of the weevils of both sexes in both squares and bolls was 

 about 14 days. Seven complete generations were developed at 

 Tallulah between the first of June and the first of November 1914. 



/C275) b2 



