188 



and wherever grasshopper eggs are to be found, and the appearance 

 in the field of this species seems to be earlier than that of E. macidata. 

 Adults of E. sericans were collected from June to September. This 

 species is thought to have one generation a year and to hibernate as 

 a coarctate larva. Adults of E. pennsylvanica were collected from 

 August to November. This species evidently hibernates as a triunguhn 

 larva. Some marked variations observed in the time required for 

 development are recorded. 



Experiments on the effect of arsenicals, contact insecticides and 

 repellents in infested fields show that attacks by the smaller beetles 

 are easily controlled by spraying with 1 lb. Paris green with lime 

 in 25-40 U.S. gals, water. Many of the larger species are killed 

 by the stronger solution. Dusting with 1 lb. Paris green to 5 lb- 

 powdered lime or with pure lead arsenate is effective against the small 

 beetles, but is not recommended for use against the larger ones. 

 Driving the beetles out of the field is recommended when the pest 

 must be checked at once. The destruction of grasshopper eggs leaves 

 the beetles without food, and any remedial measures against grass- 

 hoppers will also eliminate danger from blister beetles. 



MozNETTE (G. F.). U.S. Bur. Ent. Dusting vs. Spraying for the 

 Control of Insect Pests of the Avocado. — //. Econ. Ent., Geneva, 

 N.Y., xiv, no. 6, December 1921, pp. 465-469. 



Serious injury is caused to avocado during the dry winter months 

 by several pests, including Tetranychus yothersi, McGreg., Heliothrips 

 haemorrhoidalis, Bch., and Empoasca minuenda, Ball. During 1918 

 and 1919 tests were made with various sprays and dusts for the control 

 of these pests, the results of which have already been noticed [R. A.E., 

 A, viii, 530]. 



MozNETTE (G. F.). U.S. Bur. Ent. Control of two Scale Insects 



of the Mango. — Jl. Econ. Ent., Geneva, N. Y., xiv, no. 6, 

 December 1921, pp. 469-472. 



Eucalymnatus tessellatus. Sign, (tessellated scale) and Coccus 

 acuminatus. Sign, (mango shield scale) appear to be the most injurious 

 scales occurring on mango in Florida. They both infest the lower 

 surface of the leaves along the midribs, though when very numerous, 

 they may also be found along the lateral veins and interstices. 

 Reproduction continues throughout the 3^ear, causing considerable 

 overlapping of the generations. During the spring the scales migrate 

 from the old leaves to the new growth. In Florida C. acuminatus 

 occurs also on roseapple [Eugenia jumbos'], custard-apple [Anona 

 reticulata], sapodiUa [Achras sapota] and Allamanda ; it is also found 

 in Grenada, Barbados, Dominica, Antigua, Trinidad, Jamaica and 

 British Guiana, where in addition to the food-plants already mentioned 

 it attacks bread-fruit [Artocarpus incisa], Jasminum, Ixora, star plum 

 [Chrysophylhmi monopyrenum], star apple [C. cainito], and nutmeg 

 [Myristica fragrans] . 



E. tessellatus also infests coconut and roseapple in Florida and 

 Caryota urens and many other palms in the West Indies. 



Experiments for the control of these scales have been carried out 

 with lime-sulphur solution, caustic potash fish-oil soap, miscible oil, 



