CONTROL, OF CODLING MOTH IN COLORADO. 33 



to hatch. The next and last application should be made 34 to 36 

 days later, in advance of the hatching of the second-brood larvae in 

 maximum numbers and for protection against the third-brood larvae. 



Schedule II is similar to schedule I except that five cover sprays 

 are used instead of four, the additional application being made for 

 the first-brood larvae. The second cover spray should be applied 

 10 to 12 days after the previous treatment so as to cover the fruit 

 just in advance of the hatching of the first-brood larvae in large num- 

 bers. The next application should be made 10 to 12 days later as a 

 means of protection against the late hatching first-brood larvae. 



Schedule III includes a total of seven applications, the first four 

 being similar to those of schedule II. But in schedule III, three 

 applications should be made for the second and third broods, the first 

 of which should be applied 9 to 10 weeks after the calyx treatment, 

 previous to the hatching of the second-brood larvae. The next 

 application should follow in 24 to 26 days, just before the hatching 

 of the second-brood larvae in large numbers and the last should be 

 applied 15 to 17 days Later, for late hatching second-brood larvae and 

 protection against worms of the third brood. 



AVOID PRESENCE OF SPRAY RESIDUE ON HARVESTED FRUIT. 



Orchardists understand the importance of and will naturally give 

 attention to the carrying out of any spraying schedule in such a 

 manner as to obviate as completely as possible the presence of spray 

 residue on fruit prepared for the market. Such residue is objection- 

 able to consumers, and while there is little chance of injury resulting 

 from its use, there is no necessity under average conditions to spray 

 to an extent that results in much spray on the fruit at harvest time. 

 A heavy coat of spray residue at harvest time is frequently due to 

 an attempt on the part of the grower to protect his nearly ripened 

 fruit from an abundance of late hatching worms. This condition 

 would not be so common or serious if the proper action and same 

 amount of endeavor were directed against the elimination of the first- 

 brood worms. 



During certain seasons of unusual worminess or with particularly 

 susceptible varieties, seven treatments may not always give the 

 desired results, but it is believed that in most instances seven 

 thorough, well-timed applications will give as good results as can be 

 economically obtained in the Grand Valley. 



The foregoing schedules are based on the general average life his- 

 tory of the codling moth in the Grand Valley under normal climatic 

 conditions. But if there should occur any unusual departure from the 

 normal, a corresponding variation in the development of the insect 

 is to be expected, and the schedule of applications should be modified 

 accordingly. Small deviations, however, should not cause the fruit 



