g_0 NEW YORK STATE MUSEUM 



the scales were dead, and some scales were dead on trees 50 and 52 ; 



tree 51 was doubtful. 



\ug 3 Tree 8. The young are abundant. Trees 9 and 10. 1 he 

 young are rather few. Tree 11. The young are somewhat abundant. 

 Trees 12-14. The young are very abundant, and the fruit is badly 

 infested on tree 1 2. Trees 38 and 40 have some young scales. Trees 50 

 and 51 are infested by many young, and on trees 52 and 53 the young 

 are extremely abundant. 



Sep 7 The young are very abundant on tree 3, and extremely so on 

 trees 8-14. The young are very abundant on tree 38, and exceedingly 

 so on tree 40. The latter is also true of trees 50-53. Tree 52 is favored 

 with a number of specimens of P en tilia miseUa Lee, the mmute 

 ladybug which preys on the San Jose scale. 



Oct 25 Examinations made at this time show that the insect is still 

 breeding, and that the scale is much more abundant, some trees being 

 almost covered. 



2S % mechanical emulsion. Four trees were treated with this mixture 

 on the same day and under the same conditions as in the precedmg 

 experiment with a 20 % mechanical kerosene emulsion. Their condition 

 at the beginning of the experiment, Ap. 11, was as follows. Tree 23 was 

 a very badly infested Howell peartree about 10 feet high. Tree 24, a 

 Kieffer pear 9 feet high, had few scales on it. Tree 36, a globe peach 

 12 feet high, was moderately infested. Tree 37 of the same kind was 13 

 feet high and very badly inlested. 



Ap. 19. The bark of tree 23 is rough, and the kerosene has soaked in 

 largely. The insecticide is somewhat evident on tree 24, and the buds 

 are starting. Trees 36 and 37 ^^ow the presence of kerosene to a slight 



extent. 



May II. Tree 23 looks hard. The leaves have appeared only near 

 the tips of the twigs. There are many blossom buds. Tree 24 looks 

 fine. The numem^. 1.- .vrs art- nearly out and there are many blossom 



buds. 



May 14. Tree 23 is thinly clad with leaves, though they are pretty 

 well out. There are a few suckers and a few blossoms are opening. 

 The leaves of tree 24*are well out and it has abundant blossoms. The 

 many buds and leaves of trees 36 and 37 are starting well but they are 

 not so advanced as in trees 33-35 (treated with x% lb. Leggett's whale 

 oil soap to the gallon). The full bloom of tree 24, photographed this 

 date, is shown on pi. 5. 



