572 REPORT OF THE COMMISSIONER OF AGRICULTURE. 



16 and 23, and November 1 and 4. 1 was unable to find any living scales; tree Tvas 

 growing nicely at last-mentioned date. 



Experiment 132. Resin compound 129. 



Compound, ^ pint; water, 1 gallon. Applied October 7. October 12, all young 

 scales dry; old scales all loose and changed in color. October 15, old scales seem to 

 be dead, yet not dry; found many dead young under mother scales. November 4, 

 about three-fourths of the scales killed ; they became lirm again on the leaves after 

 two weeks; mites very numerous. 



Experiment 133. Resin compound 129. 



Compound. 1 pint; water, 1 gallon. Applied October 7. October 12, nearly all 

 scales dead and dry and changed in color; all the scales on insects that were not 

 dry loose and easily removed; mites very numerous. October 15, no living scales 

 could be found. October 22, found three newly formed scales. November 4, very 

 few young and no living old scales could be found; tree not in the least injured; no 

 leaves dropped. 



Experiment 147. Resin soap 144. 



' Soap, 1 pint; water. 2 gallons. Applied October 23. October 28, found several 

 moving young and a few newly formed scales. November 4, a few gravid females 

 still living; young increasing. 



Experiment 148. Resin soap 144. 



Soap, 1 pint; water, 1 gallon. Applied October 23. October 28, all scales killed; 

 found one moving young. November 4, occasionally one young; no old scales could 

 be found. 



Experivient 149. Resin soap 144. 



Soap, 2 pints; water, 1 gallon. Applied October 23. October 28, budding leaves 

 destroyed; old leaves dropping. November 1, a few leaves still dropping; tree had 

 been in poor condition, and this experiment was made chiefly to see result of wash. 



Experiment 154. Resin soap 152. 



Soap, 1 pint; water, 1* gallons. Applied October 27. November 8, nearly all 

 scales killed; some of the mother scales not yet dry. 



Experiment 155. Resin soap 152. 



Soap, 1 pint; water, 1 gallon. Applied October 27. November 3, found all scales 

 dead; no young could be found. 



Experiment 156. Resin compound 141. 



Compound, 2 pints; water, 1 gallon. Applied November 2. November 4, all 

 scales have changed on tree as weU as on fruit. IVIr. Craw examined the tree again 

 for me September 22, and he writes that all the young scales were dead, but many 

 of the old scales were living. 



Experiments 154 and 155 were made at a late date, and the results perhaps would 

 vary a little if examined a month later; yet the soap will do excellent work on 

 Icerya at I cent per gallon with strong spray. I believe that the wash of experi- 

 ment 154 would not kill all the Red Scales. The soap of experiment 120 is but little 

 different, yet tliis destroyed all the Red Scales, at \ cent per gallon of the wash, as 

 sprayed by Messrs. Woliskill and Craw. 



In regard to experiment 156, Mr. Craw's statement is contrary to my expectations. 

 Although I had at the time of spraying a poor pump, and the tree had not been 

 sjjrayed well, yet the spray would miss the young as well as the old scales. 



I examined tree of Experiment 133 often and carefully. In eight days nearly all 

 the scales were dry. This is the same wash as that of 156, but costs only \ cent for 

 9 pints of the wash, while in experiment 156 the cost would be 1 cent for 10 pints of 

 the wash. 



Resin compound is a good remedv in destroying Icerya and its eggs, and further 

 experiments will sliow the value of "it on Red Scale. 



The best results so far on the Red Scale Avere had with soaps 120, 144, and 152, and 

 these last two are also best for Icerya. 



The fact that there are nearly always, even with the strongest washes, young 

 scales found afterward may be largely due to the fact that the ground below thickly 

 infested trees is always covered with infested leaves which have dropped, and nat- 

 urally most of the young will crawl back upon the ti'ee again after the spraying. 

 They will also come from surrounding plants. 



