REPORT OF THE STATE ENTOMOLOGIST I9OO 981 



Experiments with a whale oil soap and crude petroleum com- 

 bmation against San Jose scale. A combination of these two in- 

 secticides was tried on 15 trees. The whale oil soap was used at the rate 

 of I pound to 4 gallons of water, and this solution was poured into the 

 barrel of the kerowater sprayer. Crude petroleum was put in the oil 

 tank, and the pump set to deliver 10% oil. The mixture was pretty 

 well emulsified in passing through the nozzles. This spraying was done 

 Ap. 20, but otherwise the conditions were the same as in the preceding 

 experiments. The condition of the trees at this time was as follows : 

 Trees 62 and 6^, early pear 8 and 12 feet high respectively, were but 

 moderately infested with the San Jose scale. Trees 64-66, Bartlett 

 pear 14 feet high, were respectively, badly, moderately and very badly 

 infested with the scale. Tree 67, a Howell pear 12 feet high, was very 

 badly infested, and tree 68, a Vermont beauty pear 10 feet high, was 

 quite badly infested. Trees 75-77, the first a Crawford and the others 

 globe peach, respectively 10, 9 and 14 feet high, were infested with but few 

 scales, except tree 77, which was moderately infested. Tree 96, a beurre 

 d'Anjou pear 9 feet high, was infested with but few scales. Trees 97- 

 100, seckel pear 10 feet high,*were all badly infested, except 99, which 

 was but moderately infested. 



May II. Tree 67 appears dead, probably from the effects of the scale, 

 as it was very badly infested in the early spring. Tree 68. The leaves 

 are nearly out and there are many blossom buds opening. 



May 14. Tree 62. The leaves are vigorous, nearly out and there are 

 a few blossoms. Tree 6^. The foliage is appearing more irregularly than 

 in the preceding, some leaves are nearly out and others just starting. The 

 leaves are pretty well out on trees 64 and 65, and the numerous blossoms 

 are open. The leaves on tree 66 are scattering, partly out and there are but 

 few blossoms. The tree is very badly infested. Tree 67 has died, undoubt- 

 edly in consequence of severe injury by the scale. The leaves on tree 

 6S are pretty well out, though rather scattering, and the abundant blos- 

 soms are open. The presence of large numbers of the scale accounts for 

 the unsatisfactory condition of the tree. The leaves and buds are just 

 starting on tree 75. The leaves are unfolding and the blossoms are well 

 out on tree 76 (pi. 12). The leaves are pretty well started and the 

 blossom buds are rather few on tree 77. The leaves on trees 96-100 are 

 pretty well out, though rather scarce on tree 96. There are few blos- 

 soms on tree 97 and many on trees 98-100. PI. 12 also shows the 

 condition of tree 98. 



