74 EXPERIMEXT STATION. [Jan. 



a])im(laiit throughout the test fields, and partly because the arse- 

 nate showed a tendency to flake and droj) otl" the corn. In most 

 cases the corn made a good start and escaped all injury, even 

 though wire-worms were clustered around the seeds in the roAV. 

 In fact, the treatment, though it did not seem to kill the wire- 

 worms, did a])])ear to protect the corn from injury in nearly 

 every case. Further experiments along this line will be made in 

 1912. 



The testing of new spray materials has not usually been 

 looked upon favorably by this department, as it has no trees 

 under its control upon which these may be used. A new mate- 

 rial called " Entomoid," for use against the San Jose scale, sent 

 to the station last year for trial, seemed so promising, however, 

 that considerable attention was given to it, trees loaned for the 

 purpose by individuals being used. Entomoid is claimed by 

 its inventor to be a combination of lime-sulfur and a miscible 

 oil, and therefore to combine the good qualities of both of these 

 materials. It was applied to young apple and plum trees con- 

 siderably to badly infested with scale, shortly before the buds 

 opened in the spring, at strengths of 1 part Entomoid to 20 of 

 Walter, and to 30 of water, using a fine Vermorel nozzle. The 

 trees were under almost continual observation thereafter, until 

 October, and the results w^ere very satisfactory with, both 

 strengths. Very few living scales could be found in June, and 

 those were all in such protected positions as would indicate a 

 probable failure of the spray to reach them. By late fall the 

 trees were well infested again, but only to such a degree as 

 would be easily accounted for by the few scales which escaped 

 treatment, and by restocking from badly infested trees nearby. 

 During the past year the inventor has modified his formula 

 somewhat, and it is the intention to continue tests with this 

 modified material the coming spring. 



In addition to the experiments outlined above, observations 

 on the dates of hatching of the oyster-shell scale, scurfy scale 

 and pine-leaf scale have been continued, and it is planned to 

 conduct tests of methods for the control of the onion maggot 

 next season, should satisfactory opportunities become available. 



While not forming a part of the Avork done under the Hatch 

 act, it may be well to mention that exhibits of injurious insects 



