116 INSECTS AFFECTING THE ORANGE 



leaf with spray and colk'ctod uiujii blotting paper, began to crawl away 

 as soon as dry, and isbowcd no injury the Ibllowinff day. Eggs and 

 molting young remained upon the leaf and were not affected. 



(2.) Solution: 1 pound to 50 gallons. Applied in foam. Free Mites 

 in great part killed. Molting young and eggs not killed. 



(3.) Solution : 1 pound to 32 gallons. Adult Mites all killed. Molt- 

 ing young in part killed. Eggs not killed. 



(4.) SoUitiou: 1 pound to IG gallons. Adult Mites all killed and shriv- 

 eled, in two or three hours. Molting Mites, about 80 per cent, killed. 

 Eggs, a large per.;entage killed. 



(5.) Solution: 1 pound to 5 gallons. Adult Mites all killed. Molting 

 Mites apparently all dead in two days. Eggs evidently affected, not 

 all killed, but many collapsed by the second day. 



(6.) Solution : 1 pound to 1 gallon. (This solution is nearly solid when 

 cold.) Mites all killed. On the second day all the eggs appeared col- 

 lapsed and dead. 



The whale-oil soap usually suj^plied by dealers is inferior to that used 

 in the above experiments. As an effective remedy for Rust-mite a solu- 

 tion of 1 pound to 5 gallons of water may be recoin mended. It should 

 be applie«l in early spring, before the new gro^vth begins. Tsvo or three 

 applications will be required, which should be made at intervals of one 

 week. The cost of the wash, at the ordinary retail price for the soap 

 (10 cents per pound), is 2 cents per gallon. 



Very weak solutions may be made effective if used at frequent short 

 intervals, but the labor and expense of making the numerous applica- 

 tions required will be very great. 



A solution of 1 pound to 5 gallons will not injure the trees, but may 

 cause the blossoms to drop. No directions can be given as to the 

 greatest strength of solution that cau be used upou blooming trees with- 

 out loss of fruit, as this depends largely upon the condition of the tree. 

 Solutions of 1 pound to 10 gallons can probably be safely used, in most 

 cases, and will be effective if several applications are made at intervals 

 of a few days. 



Sulphur. — The Mites, both adult and young, are very sensitive to sul- 

 phur, and are readily killed by it in any form in which it can be made 

 to act upon them. The eggs, however, are not readily affected, and 

 even survive an exposure to the fumes, which will kill the plant. Fu- 

 migation cannot be resorted to without extreme danger to the life and 

 heallh of the tree. The finely powdered (sublimed) flowers of sulphur 

 does not affect the plant. It adheres more readily than might be sup- 

 posed to the smooth surfaces of the leaves, and, especially when they 

 are roughened by the Mites, it is not entirely washed away by heavy 

 rains. Although it does not kill the eggs, it effectually exterminates 

 the free Mites, which are sure to come in contact with it in their wan- 

 derings, and if it can be made to remain upou the plant, the young as 

 they hatch are also destroyed. 



