174 Bulletin 245. 



Black-spot. Spray plants once a week with ammoniacal copper 

 Rose. carbonate. Mildew. Keep heating pipes painted with equal 



parts lime and sulfur mixed with water to form a thin paste. 

 Spray with copper fungicides or potassium sulfide. Under glass shake flowers 

 of sulfur over bush. Aphis, Leaf-hopper. Kerosene emulsion, whale-oil soap or 

 tobacco water applied to the insects bodies at short intervals is effective. Red 

 spider. Apply fine spray of water to the foliage ; keep house as damp as possible 

 without injury to plants. 



Leaf-blight, Mildew, i. When growth begins in spring, Bordeaux 

 Strawberry, mixture; 2. When first fruits are setting repeat i; 3. After 



fruiting, mow leaves on damp day and burn. Spray new growth 

 and non-bearing plants with Bordeaux mixture at intervals of i to 3 weeks. See 

 Bulletin 79. Leaf-roller. Spray thoroughly after fruit is picked with arsenate 

 of lead. 



Leaf-blight, i. While plants are in the seed bed, Bordeaux 

 Tomato. mixture, spraying under side of leaves. Pick off lower leaves 



as they show disease. 2. When plants are set out repeat i. 

 3, e^c, repeat i at intervals of 7 to 10 days. Rot. Spray as directed under leaf- 

 blight; unsatisfactory in most cases. Usually better to secure many pickings by 

 starting the plants early and giving the best culture; then if the rot comes, some 

 pickings stand a chance of escaping. Train the vines. 



FORMULAS. 



Arsenate of Lead. 



Arsenate of Lead 4-8 pounds 



Water 100 gallons 



Arsenate of Lead or "Disparene" can be applied stronger than other arsenical 

 poisons without injury to the foliage; hence it is very useful against beetles and 

 similar insects that are hard to poison. It also adheres to the foliage a long time. 

 Use in strength varying from i to 4 lbs. to 50 gals, of water. Ready for use as soon 

 as the paste is stirred in the water. 



Paris Green. 



Paris green •. i pound 



Water 75-150 gallons 



If this mixture is to be used upon fruit trees i pound of quick-lime should be 

 added. 



Repeated applications will injure most foliage, unless the lime is used. Paris 

 green and Bordeaux mixture can be applied together with perfect safety. The action 

 of neither is weakened, and the Paris green loses its caustic properties. For 

 potato beetles, 2 to 4 lbs. to 50 gals, is often used. Use at the rate of 4 to 12 ounces 

 of the arsenite to 50 gallons of the mixture for leaf eating insects. It is sometimes 

 used as strong as i lb. to 50 gallons, on apples, but this is usually unsafe and gen- 

 erally unnecessary. For insects that chew. 



White Arsenic. 



White arsenic being cheaper and of more constant strength than Paris green, 

 is becoming increasingly popular as an insecticide. It may be safely used with 

 Bordeaux mixture, or separately if directions as to its preparation are carefully 

 followed; if, however, these are neglected injury to foliage will result. It is unwise 



