66G EXPERIMENT STATION RECORD. 



unfavorable to the introduction of the beetle is that clean culture is 

 more or less inimical to it. 



In California where orchards were practically abandoned and became 

 filled with rubbish the beetles flourished, finding sufficient shelter 

 for the mild winters. In New Jersey, a much colder climate, much 

 greater shelter would be necessary, and in its well-cultivated orchards 

 very little would be found. Especially would this be the case in 

 orchards of deciduous trees. From these facts the author concludes 

 that even if the beetles should be introduced from California, and should 

 do just as well as they have done there, the New Jersey orchardists 

 would not be justified in relying on them to prevent or lessen the rav- 

 ages of the San Jose scale. In southern California climatic influences, 

 combined with the attacks of the natural enemies, keep the scale in 

 check. The natural enemies alone could not do so, and any dependence 

 upon them in New Jersey will, in the opinion of the author, result in 

 disaster. If anything is done example must be taken from northern 

 California, where the natural conditions much more nearly resemble 

 those of New Jersey. 



The remainder of the report is devoted to discussing (1) the relation 

 of injurious insects to their enemies, and (2) the natural enemies of the 

 San Jose scale, under which heads the author contradicts the quite 

 popular idea that one may array the forces ot nature against one another 

 with entire success. 



It is believed that natural enemies of the scale could not be introduced 

 from California into New Jersey with a good prospect of their becoming 

 sufficiently abundant within a measurably short time to be of much 

 use in keeping the scale in check. The diseases of the scale are briefly 

 treated, and a record is given of the insects introduced into New Jersey 

 as a result of the author's western journey. 



With reference to remedial measures, receipts are given for the lime, 

 sulphur and salt wash, and for resin washes; the methods of using kero- 

 sene soaps and potassium cyanid are described; and the following 

 recommendations are made: 



u (1) Destroy infested stock whenever practicable; (2) spray thor- 

 oughly as soon after the trees become dormant as possible, with fish-oil 

 soap, 1 lb. in 1 gal. of water; (3) spray again in early spring, before 

 the buds begin to swell, with fish-oil soap, 2 lbs. in 1 gal. of water, and 

 do it thoroughly ; (4) cut back or prune the treated trees a few days after 

 spraying, so as to leave no more wood than absolutely necessary for the 

 use of the tree and crop; and (5) on scaly trees use whitewash liberally 

 throughout the summer, keeping the trunks and branches covered with 

 lime as thoroughly as possible." 



Some miscellaneous results of the -work of the Division of 

 Entomology, L. O. Howard ( U. 8. J>ept. Ayr., Division of Entomology 

 Bui. 7, n. ser., pp. 87, Jigs. 44). — This publication is designed in a meas- 

 ure to take the place of Insect Life and includes the following articles: 



The ambrosia beetles of the United States, H. G. Hubbard (pp. 9-30). — 

 A popular summary of what is known concerning various species of 



