KNTOMOLOGY. 305 



pe.sts, no .scales being found on cither olive or orange trees. It iy 

 suggested that the isolation of the valley from other cultivated areas 

 and the burning effects of the sun constitute the main reasons for this 

 immunity. The author recommends strict quarantine measures regu- 

 lating the importation of fruit and ornamental trees. A number of 

 native scales were found in this region, l)ut they do not seem to be 

 especially injurious, and it is thought that this condition is brought 

 about by the natural enemies of scale insects. Notes are given on a 

 number of the more important insects of Salt River Valley, among 

 which may be mentioned Pycrwderes (juadrvmaeidatiis^ San Jose scale, 

 Colias eurytlieme^ the corn worm, Drompliila ampelophila^ the pear- 

 leaf blister mite, and the Br3^obia mite. Approved remedies are 

 suggested in connection with a discussion of each insect pest. 



Report of the entomologist, J. B. Smith {Weir JerKey Sfax. Rpt. 

 1S99, j/jK 4'21-ol'2,^p'(/.s. 4/^). — Brief notes are given on a large number 

 of injurious insects affecting ^-arious garden and field crops, among 

 which may be mentioned the pea-plant louse, the peach thrips, cod- 

 ling moth, pear slug, peach-twig borer, woolly aphis, San Jose scale, 

 Hessian fly, fall army worm, bagworms, and the tulip soft scale. 

 The author discusses various insecticides, among which may be men- 

 tioned arsenate of lead. Green Arsenoid, potash soap, kerosene, crude 

 petroleum, and whale-oil soap. The experimental orchard has been 

 increased in size. Experiments made there with various insecticides, 

 especially against the San Jose scale, are reported. General recom- 

 mendations are given regarding the time and method of making- 

 various insecticide applications to different plants. It is urged that 

 spraying should not be done except for specific reasons. A single 

 Vermorel nozzle or a group of 3 such nozzles is recommended as the 

 best for general purposes. 



Observations have been continued on the San Jose scale. This was 

 not affected by the unusually low temperature which occurred during 

 the preceding winter. Unusually large swarms of larvae appeared 

 about June 15 and lasted for somewhat more than 10 days. The sec- 

 ond brood appeared late in July, the third during the middle of Sep- 

 tember, and the fourth late in October. This insect is now reported 

 from every county in the State. Kerosene was used for the most 

 part on apple and pear trees and less frequently on peach trees with 

 only rare cases of injury to the trees. Further experiments were 

 made with crude oil, in an orchard of dwarf Duchess pears and 

 apples. A portion of the orchard had been sprayed in March with a 

 30 per cent mixture of crude petroleum and water, but this applica- 

 tion had been irregular and unsatisfactory. It had been intended to 

 treat the dwarf Duchess pears with a 15 per cent mechanical mixture 

 of crude petroleum and water. Preliminary tests, however, indi- 



