565 



Urich (F. W.). Some of the Principal Insects affecting Vegetables in 



Trinidad and Tobago. — Bull. Depi. Agric. Trinidad & Tobago, 



Porl-of- Spain, xvii. no. 2, 1918, pp. 77-87. [Received 



26th October 1918.] 



These notes, prepared for the guidance of vegetable growers, deal 



with : — (1) Agricultural operations which tend to keep down insect 



pests ; (2) natural enemies ; (3) insecticides for biting and for sucking 



insects ; (4) some of the principal insects of vegetables, grouped 



under the crops affected, and mentioning the part of the plant attacked 



and the nature of the damage, together with the necessary treatment 



and the best time for applying it. 



Report of the Director.^ — Twenty -eighth Ann. Rept. Agric. Expt. Sta. 

 New Mexico Coll. Agric. & Mechanic Arts, State College, Las 

 Graces. 1916-1917, 92 pp, 12 figs. [Received 29th October 1918.] 

 Experimental applications of lime-sulphur sprays on apples and 

 pears against the San Jose scale [Aspidiotus perniciosus] seemed to 

 indicate that an effective dormant spray might be applied later in 

 the season than was formerly supposed. Local infestations of 

 Murgantia hislrionica (harlequin cabbage bug) were not severe enough 

 to warrant any extensive remedial measures. There were two genera- 

 tions in the year, approximately 150 eggs being laid per female in a 

 period of 4 to 6 weeks. Decisive results were obtained by the use 

 of Blackleaf 40 against melon aphis [A. gossypii]. Grasshoppers 

 did an unusual amount of damage in certain sections, and Toxoptera 

 graminum (wheat aphis) occasioned great damage in the wheat sections 

 on account of the backward spring. A local, but acute, infestation of 

 Eriophyes pyri (leaf blister mite) was reported from New Mexico. 

 A leaf-mining fly, Agromyza f^cutelhia, Fall., did considerable damage 

 in the spring of 1917 to early potatoes and beans, the infestation being 

 noticeably reduced by spraying with Blackleaf 40, 1 : 400, powdered 

 lead arsenate being added at the rate of 2 lb. to 50 U.S. gals. Agromyza 

 pusilla (alfalfa leaf-miner) was very abundant at the same time. 

 Monoxia jyuncticollis, var. erosa was generally distributed on sugar- 

 beet fields in one district, but the damage was not serious. Eutettix 

 tenella (sugar-beet leaf-hopper) was noted in connection with the 

 bacterial disease, curly leaf, in a good many fields. Investigations 

 on the life-history of the codhng moth [Cydia pojnonella] weie continued 

 and a spraying schedule was worked out for 1917, based on data 

 previously collected. However, because af the very late spring, 

 which retarded the blooming of fruit trees about a week and the 

 emergence of moths about two weeks, it became necessarv to make 

 a corresponding change in the schedule. 



Gillette (C. P.). Some Grass-Root Aphids (Hem., Horn.). — Entom. 



News, Philadelphia, xxix, no. 8, October 1918, pp. 281-284, 



1 plate. 



At Fort Colhns, in Colorado, the alate forms of Forda formicaria, 



Heyden, (Rhizoterus vacca, Hart., Tychea graminis, Koch, Forda 



occidentalis, Hart.) begin to appear about 10th June and to migrate 



from the grass roots. At the end of about 4-6 weeks, the entire 



colony becomes winged and leaves the host-plant, apparently to seek 



others of the same sort ; at least, the insects are found later in the 



