'New York Agricultural Experiment Station. 409 



insecticide that will stay where it is put, and at the same time 

 we must use some material that will carry enough poison to kill 

 the loopers even though they eat but a small portion of the in- 

 secticide. 



recommendations. 



The foregoing conditions show some of the reasons why better 

 success is not obtained by the use of most of the numerous meas- 

 ures that are in vogue with the growers of cabbage against the 

 cabbage worm. They also show how impractical the use of any 

 of these measures will be when used for the looper. The results 

 obtained in 1896 by the use of resin lime mixture and Paris green 

 for the cabbage worm showed conclusively that the two applica- 

 tions, one made while the plants are small, and the second after 

 they had commenced to head, yielded results at least 50 or 60 per 

 cent better than did the use of Paris green and flour, although 

 the latter is one of the surest of the old methods of treating the 

 cabbage worm. The above results taken in combination with all 

 the conditions that must be met leads us to recommend the spray- 

 ing of late cabbage twice for the looper, at least once for the cab- 

 bage worm, with the resin lime mixture. (The term late cabbage 

 is so variable on Long Island that no exact dates for spraying can 

 be given.) If the applications are made with care all the leaves 

 will be fairly well protected on both sides as the mixture stays 

 where applied. It is not claimed that it will pay to apply the 

 resin lime mixture except in the fall of the year. The results 

 obtained from the use of resin-lime mixture on cabbage in 1896, 

 and on cauliflower in 1897 against the cabbage looper, were 

 just as marked; at least when we consider the amount of damage 

 done by this pest, and, at the same time take into consideration 

 its habits and the range of its food plants. Only two applications 

 of the resin lime mixture are recommended for the cabbage 

 looper, but these two applications must be thoroughly made and 

 at the right time. In all cases the best results will be obtained if 

 the first application is made on both cabbage and cauliflower when 



