EXPERIMENT STATION REPORT. 58$ 



of lead now on the market ; simply to call attention to the varia- 

 tion in the amount of arsenic and price, and to give a basis of com- 

 parison with Paris green, Mhich farmers have learnt to use. The- 

 increasing price of Paris green and the decreasing price of the 

 arsenate of lead may bring them nearer to an equality in economy 

 of application, and then the arsenate of lead will be the most de- 

 sirable material. 



Pari* Green. 



The sale of this material is now regulated by law in New Jer- 

 sey and a large number of samples were analyzed by the chemist 

 of the Expi'riment Station. The results of the work done were 

 published in P)ulletin N"o. 195, and need only to be referred to 

 here. The im])<irtant point to be noted is that almost all the- 

 samples, and all the samples of reputable manufacturers, come up- 

 to the required standard and contain no excess of water soluble 

 arsenic. Wherever it can be nsed without danger to plant foliage 

 this is still the most uniform, and, on the whole, the cheapest of 

 the arsenical insecticides on the market. 



Failures to obtain satisfactory results from its use are usually 

 due to some neglect on the part of the users, but there is a small 

 percentage of cases where the material has not been effective and 

 where no apparent fault can be imputed to the operator. It seems 

 as if some unrecognized condition might exist, climatic or other- 

 wise, which in some way influences the resisting powers of the 

 insects. 



Antidin. 



This rs a powdery material of unknown vK^riposition received 

 from Europe with the statement that it was used there with satis- 

 factory results on Phylloxera. It was also claimed that it could be 

 used against scale insects and that trees badly infested by the San 

 Jose scale had been completely freed. 



Unfortunately only a small sample was scut in, though more 

 was promised, and it was impossible to carry out the plans made 

 for its thorough trial. A material that kills the grape Phylloxera 

 might be expected to act equally well on root-maggots, and it was 

 with these that the chief work was to be done, but lack of material 

 prevented. 



