54 MAINE AGRICULTURAL EXPERIMENT STATION. 



part to ten of water is sufficient when the concentrated solution 

 tests 31 degrees Beaume. This insecticide may be applied either 

 in the fall after the leaves have fallen or in the spring anytime 

 before growth starts. The reason that a dormant spray is 

 effective is that the adult mites hibernate under the bud scales, 

 and a thorough spray, which should coat the tree completely, 

 will kill them, thus preventing their injury the following season. 

 When once reduced in numbers, the mites do not ordinarily gain 

 ground rapidly and control measures are not required every 

 year. The orchardist himself can judge as to when the damage 

 is severe enough to make treatment advisable, if care is taken 

 to ascertain whether the leaf injury is due to mites, leaf-spot 

 fungi or spray injury. 



Spraying for the leaf blister mite has passed the experimental 

 stage and the satisfactory results of this treatment have been 

 demonstrated many times in large commercial orchards. Judg- 

 ing from the appreciative letters of thanks received by this 

 Station from people who used lime-sulphur at our recommenda- 

 tion, this spray evidently is as efficient under Maine conditions 

 as elsewhere. The leaf blister mite is widely spread and seri- 

 ously abundant here and any earnest orchardist who has had 

 a heavy infestation of this pest during the summer just past 

 would do well to give it the attention of a thorough spray as a 

 part of his fall or early spring calendar as an assurance of better 

 conditions next year. 



AAA. INSECTS ON OR IN THE FRUIT. 

 (Divisions a, b, c, and d.) 



a. Caterpillars with 3 pairs of thoracic and several abdominal legs. 



Full grown caterpillar less than V2 inch long, with an anal 



fork, mining in the fruit. The anal fork can only be seen 



with a high power microscope, the larva being slightly 



compressed between cover glass and slide. 



1. Lesser apple worm. Page 55. 



Full grown caterpillar nearly % inch long without an anal 

 fork, mining in the fruit, (fig. 40). 



2. Codling moth. Page 55. 



Full grown mottled caterpillar, 1V2 inches long eating into 

 the fruit. Mottled fruit caterpillar. Page- 28. 



Smooth light yellowish or apple green caterpillars with cream- 

 colored stripe down middle of back and along each side. 



Green fruit-worms. Page 29. 



