REPORT OF THE STATE ENTOMOLOGIST 1903 149 



poisons, paris green, london purple and similar preparations are 

 very effective, though subject to washing by rains. These latter 

 substances should be used at the rate of 1 pound to 100 gallons 

 of water, with 1 pound of recently slaked lime to protect the 

 foliage from burning. Spray thoroughly in any event and aim 

 to cover so far as possible every leaf with the poison. Protective 

 measures should be adopted early or the injury will be beyond 

 repair. It is hardly necessary to add that it is impossible to grow 

 magnificent trees if they are defoliated year after year, as unhap- 

 pily seems to be the case in some cities in recent years. 



Fall webworm (Hyphantria textor Harr.). This 

 species appeared rather early in the season on various forest and 

 fruit trees in different sections of the State, and in certain local- 

 ities was somewhat abundant and destructive. Generally speak- 

 ing it has not caused serious injury except in a few localities 

 where no effort was made to check it. This species, like the two 

 tent caterpillars, is readily controlled by spraying with an arsen- 

 ical poison, and its conspicuous web nests, which serve as a retreat 

 for the caterpillars, are easily removed from the tree and the 

 inmates destroyed by crushing or burning. 



Forest tent caterpillar (Malacosoma disstria Htibn.) . 

 As noted in our preceding report, Museum bulletin 64, page 104, 

 the ravages of this pest are on the decrease, and the present season 

 has witnessed practically no injury by this insect. A few cater- 

 pillars were observed in Kensselaer and Columbia counties but 

 in no instance coming to our notice was a tree even partially 

 defoliated. A lack of reports from other sections of the State 

 indicates a like gratifying condition, and we are in hopes that 

 this outbreak is practically ended and that the species will be com- 

 paratively innocuous for a number of years. 



Walnut worm (Datana integerrima Grote & Kob.). 

 The work of this insect is more or less evident each year, particu- 

 larly in the western part of the State, and during the past summer 

 our attention has been called to its ravages in Herkimer county, 

 and we have observed a number of black walnut trees in Chautau- 

 qua county which have been from one half to two thirds or entirely 

 defoliated by this caterpillar. 



