New York Agricultural Experiment Station. 481 



use of the poison the arsenate of lead was allowed to dry before 

 the insects were introduced in their respective cages. As an addi- 

 tional check on these tests a liberal supply of plant lice was supplied 

 to several of the lots after the spray had dried on the foliage. Some 

 of the details of these tests and results of the different treatments 

 are indicated in the accompanying tables. 



Table I. — Effects of Arsenate of Lead on Tkee Crickets. 



On QLcanthus atignslipennis. 

 No. of Effect after 



Lot Treatment. ten days. 



1 Lead arsenate* All crickets dead. 



2 Lead arsenate " 



3 Lead arsenate and a supply of plant lice " 



4 Lead arsenate and a supply of plant lice " . " 



5 Check All crickets alive. 



6 Check " 



On (Ecanthus niveus. 



1 Lead arsenatef All dead. 



2 Lead arsenate and a supply of plant lice " 



3 Check All alive. 



♦Poison applied July 16. fPoison applied July 25. 



The above tests are not as conclusive as we should desire because 

 of the small numbers of crickets in the different lots and the little 

 freedom given them for foraging activities. However, the results 

 point out the fact that these creatures are, under certain circum- 

 stances, leaf-eaters and suggest that they, in common with other 

 species of insects with leaf-eating habits, run risks from arsenical 

 poisoning in well-sprayed orchards. 



PREVENTIVE AND REMEDIAL MEASURES. 



The facts brought forth in this bulletin indicate that the snowy 

 tree cricket is most abundant in neglected orchards and that there 

 is little to fear from this insect in plantings that receive careful 

 attention. Cultivation to destroy foreign vegetation, as weeds and 

 brush, about and in the orchard and to keep the ground about the 

 trees clean is especially recommended. Such treatment seems not 

 only to afford protection from the tree crickets, but in the case of 

 orchards which lack vigor the trees will be stimulated to outgrow 

 the various disorders to the bark that have attended oviposition 

 by these insects. While the susceptibility of this species to arseni- 

 cals has not been conclusively demonstrated, it is believed that the 

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