52 EXPERIMENT STATION RECORD. 



are considered the most effective enemies of these pests. Cultivated plants may 

 usually be protected against the attacks of slugs and snails by dressings of soot and 

 lime, salt and lime, caustic soda and lime, or powdered coke. Caustic soda should 

 be used at the rate of 4 parts to 96 parts of lime. All materials used to destroy slugs 

 should be iu a finely pulverized form. 



Reports of the deputy commissioner of horticulture, A. Craw and E. M. 

 Ehrhorn {Bien. Rpt. Comr. Hort. Cat, 1903-4, PP- 34-39) .—Scutellista cyanea is re- 

 ported as continuing its successful work as a parasite of the black scale. The latter 

 pesl is completely controlled hy the parasite in many localities. Notes are also given 

 nn Saissetia olese, a South African parasite of the black scale, and on the damage due 

 to Diaspis pentagona. 



Condition of orchards and nursery stock in Utah and Oregon, J. Isaac (Bien. 

 Rpt. Comr. Hort. Gal., 1903-4, pp. 29-33). — A brief account is given of the conditions 

 which were found to prevail in orchards and nursery stock in Utah and Oregon, 

 with especial reference to injurious insects which might be imported into California. 

 Attention was called to the existence of eastern peach-root borer in both Utah and 

 Oregon, and the necessity of quarantining against it. 



Bug v. bug, J. Isaac (Bien. Rpt. Comr. Hort. Cal., 1903-4, pp. 79-107, pis. 4, 

 Hgs. 18). — In this article the author presents a general account of the value of pre- 

 daceous and parasitic insects in the control of insect pests. 



A list is given of the beneficial insects which were exhibited by the California 

 commissioner of horticulture at the St. Louis Exposition. The illustrations of the 

 value of parasitic and predaceous insects are largely drawn from the extensive experi- 

 ence which the fruit growers of California have had with this method of fighting 

 insect pests. It is stated that in California the chief reliance is placed on the use of 

 efficient artificial insecticides, but that in addition to the application of washes, dips, 

 and fumigating methods every effort has been made to secure parasitic and preda- 

 ceous insects to assist in the control of insect pests. Detailed notes are given on a 

 huge number of such beneficial insects and upon the effectiveness of their parasitism. 



The cotton worm, G. P. Foaden (Jour. Khediv. Agr. Sue. and School, 6 (1904), 

 No. 6, pp. 1 J). — Detailed notes are given on the habits and life history of Prodenia 

 littoralis. The eggs are laid on only one or two leaves of each cotton plant. Heavy 

 irrigation while the caterpillars are in the soil is beneficial. 



According to the author the main reliance is to be placed in picking and destroy- 

 ing leaves on which eggs have been deposited. The incubation period for the eggs is 

 :: or 4 days, and the infested leaves should be picked during this period. Chemical 

 insecticides are believed to be of little avail against this pest. 



The cotton bollworm in Georgia. Insects injurious to corn and truck crops, 

 R. I. Smith (Ga. Bd. Ent. Bui. 16, pp. 25-53, figs. 15). — For controlling the bollworm 

 the author recommends planting corn as a trap crop in rows 200 to 300 ft. apart 

 throughout the cotton field, and from May 15 to June 1. Poison should be applied 

 as soon as the worms appear on the cotton. For this purpose Paris green is effective 

 and should be dusted on the plants. The Paris green should be mixed with dust in 

 the proportion of 1:4 and should be applied so as to use 2 lbs. Paris green per acre. 



Biological and economic notes are also given on cotton caterpillar, Diatrxa saccha- 

 ralis, corn-root worm, squash-vine borer, squash bug, cucumber beetle, potato beetle, 

 flea beetles, cabbage worms, and plant lice. 



Beet worms and their remedies, C. P. Gillette and S. A. Johnson ( Colorado 

 Sta. Bnl 98, pp. 22, pis. 2, figs. J).— The beet web worm (Loxostege sticticalis) causes 

 more or less injury to sugar-beet fields in the State every year. 



The insect feeds upon beets, cabbages, onions, pigweed, Russian thistle, alfalfa, and 

 perhaps other plants. Eggs are laid in clusters or sometimes singly and the insect 

 winters over in the larval or pupal condition. This pest may be controlled by deep 



