370 The Spraying of Plants. 



TOBACCO. 

 INSECT ENEMIES. 



Tobacco worm (PhlegetJwntius Carolina, Linn.). Description. 

 The moth closely resembles the tomato worm as regards color 

 and habits. There are two broods in the South, and it is here 

 that much injury is done to the tobacco plantations through 

 the ravenous appetite of the worms. 



Treatment. The destruction of the insect by means of the 

 arsenites appears to be the most feasible method. The follow- 

 ing practice appears to be safe and efficient : l " To those who 

 wish to use poison I would advise the use of (a) Paris green, 

 I pound in a forty-gallon barrel of water, with a little white- 

 wash well stirred in. (6) That the mixture be kept well stirred 

 in the barrel and sprayer, (c) That applications should begin 

 by the tenth of June and be repeated every two weeks by top- 

 ping, and that no applications should be made after that time." 

 Hand picking may also be resorted to. 



TOMATO. 



FUNGOUS DISEASES. 



Blight ( Cladosporium fulvum, Cooke) . Description. Af- 

 fected leaves first show dark-brown spots on the under side. 

 The upper surface at the same time turns yellow and the edges 

 of the leaves curl downward, as a rule. As the disease pro- 

 gresses, the foliage shrivels and eventually dies, leaving the 

 naked stems. The fungus is found both in greenhouses and 

 out of doors. 



Treatment. For the treatment of the blight when found 

 upon plants grown under glass, see GREENHOUSE PESTS. When 

 the fungus appears out of doors, the plants should immediately 

 be thoroughly sprayed with the Bordeaux mixture, or modified 

 eau celeste, repeating the treatment at intervals of ten days or 

 two weeks, until no further infection is feared. 



Rot (Macrosporium Tomato, Cooke). Description. This 

 fungus generally attacks the tomatoes when they are over one- 

 half grown. The blossom end is attacked, the appearance of a 

 small black spot being the first indication of the disease. This 



i Peter, Ky. Agric. Exp. Sta. Bull. 53, 139. 



