880 EXPERIMENT STATION RECORD. 



Coffee-leaf miner and other coffee pests, M. T. Cook and W. T. Horne 

 (Estac. Cent. Agron. Cuba Bui. 3, pp. 22, pis. 5, fig. 1). — A brief historical state- 

 ment is made regarding coffee cultivation in Cuba. 



At present Cuba does not produce enough coffee for home consumption. In 

 order to increase the acreage of coffee it is desirable to have information avail- 

 able for coffee growers on the most important insects of this plant. The coffee- 

 leaf miner causes a loss of about 20 per cent of the coffee crops in Porto Rico, 

 Brazil, and Cuba. The injuries produced by the pest consist in large irregular 

 red spots on the leaves. The insert was reared under artificial conditions in 

 the laboratory for the purpose of studying its habits and testing remedies for its 

 control. The larva of the coffee-leaf miner appears to feed upon the 2 upper 

 layers of mesophyll cells beneath the epidermis. 



A number of parasites of the pest are known. One artificial treatment 

 against the coffee-leaf miner consists in picking and destroying the leaves. This 

 is a tedious method, however, and injures the plants. Since the larvae are 

 inside of the leaves it is impossible to reach them immediately by insecticides. 

 The pupa?, however, are on the outside of the leaves, and may be destroyed by 

 the use of kerosene emulsion containing one part each of kerosene and soap per 

 8 parts water. Good results are obtained from the use of this remedy both in 

 the laboratory and field. 



The insect produces numerous broods and this necessitates frequent spraying. 

 It is recommended that the application of kerosene emulsion be made regularly 

 twice a week, beginning (3 or 8 weeks before the close of the rainy season and 

 continuing until the commencement of the dry season. Biological and economic 

 notes are also given on the hemisphere scale and other scale insects, mealy bugs, 

 boring insects, case borer, nematode worms, leaf spot, Hemileia vastatrix, titil- 

 bum flavidum, etc. 



Treatment for the potato beetle, C. A. Zavitz (Ann. Rpt. Ontario Agr. Col. 

 and Expt. Farm, 31 (1905), pp. 199, 200). — For the past 10 years a comparative 

 experiment has been in progress for the purpose of determining the relative 

 value of potato-bug finish, Paris green mixed with plaster and water, and bug 

 death dry and in water. 



The Paris green has been used at the rate of 1 lb. in 96 gal. of water per 

 acre or 1 lb. in 38 lbs. of plaster, while potato-bug finish was used at the rate 

 of 20 lbs. per acre, and bug death at the rate of 32 lbs. The yield of potatoes 

 sprayed with bug death appeared to be somewhat higher than was obtained 

 when other insecticides were used. The cost of Paris green application per 

 acre, however, was GO cts., while that of bug death was $0.72. 



Apple maggot, F. W. Card and M. A. Blake (Rhode Island Sta. Rpt. 1905, 

 pp. 197, 198). — A number of apple maggot pupa? were placed in the soil in 

 frames and the soil was cultivated from 7 to 10 days to a depth of 2 to 3 in. 

 Other pupa? were placed in similar frames in which the soil was not cultivated. 

 For some reason none of the pupa? emerged. 



Winter apples from orchards in which hogs were allowed to run were com- 

 paratively free from maggots, and the results indicate that pasturing the 

 orchard will destroy enough of the maggots for practical purposes. Fall pip- 

 pins and winter apples were almost wholly free from injury, while in a tilled 

 orchard early varieties of apples were badly injured. 



Spraying for San Jose scale, II. E. Hodgkiss, F. A. Sirrixe, and E. L. Baker 

 {New York State Sta. But. 273, pp. .'i73-500, pis. J/). — In this series of experi- 

 ments 5 orchards were selected in Geneva and Northville containing 596 apple, 

 plum, and peach trees. 



Applications with lime-sulphur-salt were made between November 11 and 

 December 1. For purposes of comparison various formulas were used including 



