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146 = - REPORT OF THE COMMISSIONER OF AGRICULTURE. ° 
Experiment 187.—Resin compound and arsenic, of which 1 
Fea wash. 
Compound, 1 part ; water, 4 parts. Applied September 2, on L. hesperidum on» 
Orange. .September 7, scales ail dead. September 138, no living scales; about 
one-fourth of the leaveshavefallen. October 7, tree in good condition ; not injured ha’. 
beyond the loss of a few leaves ; all scales, lichens, and fungus destroyed. No- ae 
_ vember 22, tree in very good condition ; no living scales. ee 
whieh ss 
Experiment 189.—Resin compound and arsenic, of which 1 pound in 170 gallons— ~ 
on Pear (Experiment 160). Rain fell for two days following, and the result, per- 
\ 
wash. 
Compound, | part; water, 16 parts. Applied September 13, on L. hesperidum 
on Orange. October 7, many scales still living; nearly half of the leaves have 
fallen. November 22, all scales dead; tree in good condition. December 17,no ~— 
living scales on tree. 4 ere: 
Experiment 190.—Resin compound and arsenic, of which 1 pound in 300 gallons 
wash. ‘ 
Compound, 1 part; water, 4 parts. Applied September 18, on L. hesperidum 
on Orange. September 21, scales nearly all dry ; no leaves whatever have fallen, 
October 7, scales all dried up; no leaves have fallen. November 22, no scales on i 
tree, which is in very good condition. ; 
EXPERIMENTS WITH RESIN COMPOUND. : ¥ 
The strongest application of this was made on Pear and Plum, infested with 4. _ 
rapax, August 27; three parts of the compound to four of water (Experiment _ 
176). September 7, all traces of wash had disappeared, not injuring the foliage of 
‘Plum. The leaves of Pear were very brittle for the first few days, and some tips 
of older leaves turned black, but none came off, and otherwise no injury was done. 
An occasional living scale was found October 7. : 
One part of the compound to two of water. Applied February 28, on A. rapax 
haps, was not as good as it would otherwise have been. <A careful examination on 
March 8 showed that a large part of the eggs had been destroyed, also all the young ~ 
and many ofthe older scales. On this tree they did not increase, and November 21 
hardly any living scales could be found. Other experiments were made of the 
same strength, on Aspidiotus sp., on Currant and A. rapax on Pear, August 27 
(Experiment 175). All but a few gravid females were dest oyed on Pear, and very — 
few remained on such places where they had been in thick layers on Currant. | 
October7 afew young scales were found on both plants ; but hardly any were living 
November 22. "The wash disappeared in ten days, leaving the trees in good condi- 
tion ; no leaves fell. yl 
Three parts of compound to eight of water was applied on Orange, thickly in- 
fested with Lecanium hesperidum, September 2 (Experiment 184). In five days 
after appiication no living scales could be found, and none on November 22, The - 
tree was not at all affected by the wash. 
One part of compound to four of water applied on Pear, with A. rapaa, February — 
28 (Experiment 159), destroyed all the smaller and part of the older scales, but none 
after the scales were increasing again. The same strength was also applied on 
Diaspis rosce on Rose, March 8 (Experiment 62). This effectively cleared the plant 
of scales. And again, on L. hesperidum on Orange, September 2 (Experiment 183), 
All scales were dead September 7, and none living could be found November 22. 
One part of compound to eight of water, on L. hesperidwim on Orange, September 
2 (Experiment 182), destroyed nearly all scales, but many living young were found 
under mother scales September 7; only very few living scales were found on trees — 
September 13 and October 7; but on November 22 the tree was covered with scales 
again. ! ; ie 
Other experiments of this strength were made and may be worthy of mention. 
On L. olee on Orange and on several peach trees in full blossom, infested with the 
Lecanium, bred from Oak (Q. agrifolia): here also many of the scales ‘survived; , 
the trees subsequently were loaded with fruit, as well as those not treated.) | im: 
| 
EXPERIMENTS ON APHIDID WITH RESIN COMPOUND. 
The Wooly Aphis (Schizoneura lanigera), the Cabbage Aphis (Aphis brassice), the 
Plum Aphis (Aphis pruni), and Aphis on Rose (Siphonophora rose). Two experi-__ 
ments were made at Berkeley on the Wooly Aphis, in conjunction with Messrs. Klee 
and McLennan, Oneand three parts of the compound were used to eight of water. 
