4 Department Circular 176, U. S. Dept. of Agriculture. 



wooden cover. The lime barrel sliould have a flat paddle for 

 stirring. 



The hluestone 'barrel. — For this, use 1 pound of copper sulphate 

 to each gallon of clean water, suspending the crystals in a clean 

 gunny sack in the top of the water until all are dissolved. Forty 

 or fifty gallons is a good quantity to make at one time. The crystals 

 will not dissolve completely if thrown on the bottom of the barrel, 

 because the solute is heavier than water and settles around them. 



The lime barrel. — Use stone lime in the same proportions (1 pound 

 to each gallon of water) . Slake in a minimum quantity of the water 

 usually in the barrel, keeping track of the amount of water used, then 

 add the remainder of the water and stir thoroughly each time before 

 dipping ; otherwise you will be using lime ivater at first and not ynilk 

 of lime., and in this case the top part of the barrel will give an acid 

 Bordeaux, injurious to the foliage, and the bottom a thick pasty 

 Bordeaux that can not be sprayed. 



In making Bordeaux it is of the utmost importance to use good 

 well-burned lime, to slake carefully, and to stir the lime each time 

 before using. The water also must be free from straws, chaff, small 

 sticks, or shreds of any sort which will clog the sprayer and cause 

 vexatious delays. Wooden pails must be used, not galvanized-iron 

 pails or tin ones, since the metal will precipitate the copper. A 

 Vermorel or equivalent nozzle must be used, so as not to waste the 

 spray. 



WEEDS AND ORNAMENTAL PLANTS. 



We have found the fungus causing this tobacco disease on a weed 

 in one of the seed beds and on a white-flowered tobacco grown for 

 ornament in a garden. It should be looked for everywhere in the 

 fields and around houses on solanaceous weeds (the black nightshade, 

 the horse nettle, the bittersweet, the jimson weed, the husk tomato or 

 ground cherry, etc.). Any spots at all suspicious on any such plant 

 should be collected and turned over to the Government agents, who 

 will help all that is possible. Weeds liable to harbor this fungus 

 should be removed from the vicinity of seed beds, and later from the 

 whole region, if necessary. Inasmuch as peppers, tomatoes, egg- 

 plants, pepinos, and potatoes belong to the same family as tobacco 

 and are near relatives of it, they also should be watched. Ornamental 

 plants of this family should be discarded. 



The amount of damage done by the disease this year will depend 

 in large measure on the character of the season. If the weather is 

 moderately dry the bulk of the crop will probably escape. Days 

 with frequent rains are favorable to the disease, while dry weather 

 tends to check it. 



o 



