REPORT OF THE STATE ENTOMOLOGIST I9OO 971 



May 28. The leaves on tree 23 are still thin, but the weakness is 

 doubtless due in considerable part to the large number of scale insects on 

 the tree. 



June 20. Living scales were found on several of these trees. 



July 2. Young scales are rather abundant on tree 23, there are appar- 

 ently none on tree 24. Few young scales are found on trees 36 and 37. 



July 16. The presence of living young on these trees shows that 25 % 

 kerosene emulsion will not kill all the scales on dormant trees. This led 

 to their being sprayed with a 10 % mechanical emulsion under the same 

 conditions as those treated with the 20 % emulsion (see under the latter 

 head). 



July 19. The foliage was uninjured, and no living young scales were 

 found. 



July 30. Practically the same conditions obtained as on the 19th, 



Aug. 3, There were comparatively few young on tree 23, and on tree 

 24 none were found. Some young scales were found on trees 36 and 37. 



Sep. 7. Young scales are abundant on tree 23, the leaves of which are 

 partly curled. The tree looks pretty hard. There are very few or no 

 young on tree 24, which is green and vigorous. Young scales are rather 

 abundant on tree 36 and very abundant on tree 37. 



Oct. 25, There has been no material change except that the scale is 

 more abundant. Tree 23 is in a very bad condition. 



Experiments with undiluted kerose?ie. It appeared very risky to spray 

 with this substance; consequently the number of trees treated was limited 

 to three. Their condition at the beginning of the experiments, Ap. n, 

 was as follows. Tree 20 was a very badly infested Bartlett pear 8 feet 

 high. Tree 21 was a very badly infested Howell pear 9 feet high. Tree 

 107 was another badly infested Bartlett pear 8 feet high. 



Ap. 19. The kerosene is somewhat evident on trees 20, 21 and 

 hardly so on tree 107. 



May 11. Tree 20 is in a very bad state, but possibly this is due as much 

 to the abundance of the scale, which almost covers the tree, as to the 

 treatment given. The tips of several limbs show a few leaves starting. 

 Many suckers have been thrown out at the base of the tree, and on these 

 the leaves are farther out. Tree 21 is in almost the same condition. -It 

 is nearly covered with the scale and looks very bad. The leaves are be- 

 ginning to appear at the ends of the twigs, and a few blossoms buds are 

 opening, (pi. 4.) The leaves are starting on the tips of some twigs on 

 tree 107 and on its suckers. The suckers on these young trees, 20 and 

 107, show to some extent how seriously the scales have aifected them. 



