EXPERIMENT STATION BULLETINS. 415 



lime-sulphur or other efficient scale destroyer, the same as directed for 

 apple orchards. 



Just before the flower buds open, — spray with dilute lime-sulphur or 

 the bordeaux-mixture aud to every 50 gallons add iy2 pounds of arsenate 

 of lead powder. (On Japanese varieties alwaj^s use self-boiled lime- 

 sulphur.) This is to prevent leaf-spot, brown-rot, black-knot, and cur- 

 culio. 



Immediately after the blossoms fall, — it is very essential to spray to 

 prevent leaf diseases, brown-rot, aud curculio. Use dilute lime-sulphur 

 or bordeaux-mixture. For each 50 gallons of whatever is used, add 1 

 pound of arsenate of lead powder. 



This is an important spraying. Be on time and be thorough. 



Ten days or two weeks later, — it may pay to repeat the previous spray- 

 ing, especiall}^ if the weather is wet or the curculio serious. With varie- 

 ties that are susceptible to the brown-rot, it may pay to make sprayings 

 every ten days or two weeks until there is danger of staining the fruit ; 

 stopping at least a mouth before picking time. If desirable to make 

 later applications use a sulphur dust or a spray of weak copper-sul- 

 phate, — one pound of copper-sulphate to 150 or 200 gallons of water. 

 Poison need not be used. 



Black Knot. Early in the spring a careful inspection should be made 

 of every tree, and all "black-knots" cut out and destroyed. Cut back 

 several inches below the knot. Disinfecting cuts as for pear-blight is 

 not necessary. Wild cherry trees harbor the disease and if diseased 

 ones are near plum or cherry orchards, the wild trees should be destroyed, 

 if possible. 



Sulphur Dusts. Eecent experiments made by the Horticultural depart- 

 ment have demonstrated the efficiency of lime-sulphur dust of 90 per 

 cent sulphur and 10 per cent hydrated lime, applied ten days or two 

 weeks before picking, for the control of brown-rot after harvesting. 

 (See Michigan bulletin No. 115 for further details.) 



Spraying Cherry Orchards. 



Inspect sweet cherry trees for scale and if found spray as for apple 

 orchards. Sour cherries are not commonly troubled by the San Jose 

 scale; therefore it is seldom necessary to spray them with strong lime- 

 sulphur. 



Just before the blossoms open, — spray with dilute lime-sulphur (li/o to 

 50) or bordeaux-mixture to prevent leaf-spot and brown-rot. The 

 application of this spray at this time is especially advisable Avith Eng- 

 lish Morellos and in orchards infested with leaf-spot the previous sea- 

 son. 



Just after the blossoms fall, — spray with dilute lime-sulphur (li/^ to 

 50) or bordeaux-mixture, to every 50 gallons of which add one pound 

 of arsenate of lead powder. This application is to prevent leaf-spot, 

 brown-rot, curculio and slugs. 



Ten days or two weeks after the above spraying, — it is necessary to 

 make another application of the same mixture. 



Another application as above should be made about July first 

 especially if weather conditions have been favorable for the develop- 

 ment of leaf-spot. Also, an application should be made directly after 



