MAY: FOURTH WEEK 137 



plants. Use tobacco dust or kerosene emulsion on seedling 

 plants; Bordeaux and lead on tomatoes and potatoes. 



MEALY BUG. A scale-like insect with cottony covering, 

 attacking some flowers. It seldom appears in the vegetable 

 garden. Use kerosene emulsion; or apply alcohol with a 

 small brush. 



POTATO BEETLE. Use arsenate of lead or Paris green. 

 On eggplants use lead only, and pick by hand. 



ROSE BEETLE. Pick by hand and use strong arsenate 

 of lead. 



SQUASH BUG. A lively, flat, black fellow. Use tobacco 

 dust, or pick by hand to get rid of old bugs and eggs; use 

 kerosene emulsion or nicotine sulphate for the young ones. 



SQUASH BORER. Slit stem near base of plant, and de- 

 stroy the borer. Cover wound with fresh soil. 



WHITE FLY. Attacks tomatoes, vine crops and some 

 flowers. Not conspicuous until large numbers have prop- 

 agated. Use tobacco dust as repellent; spray with nicotine 

 preparations and kerosene emulsion. 



MILDEW. Attacks cucumbers, melons, Lima beans, roses 

 and other flowers. Dust with flowers of sulphur to prevent 

 spread. Use regular Bordeaux-lead spray as an effective 

 preventive through the season. 



BLIGHT, affecting cucumbers, potatoes and other things, 

 in various forms. Spray with Bordeaux frequently enough 

 to keep all new growth covered. Dust with sulphur-lead 

 preparations. 



ANTHRACNOSE, "leaf spot" or "rust," attacking beans, 

 tomatoes, celery and some flowers. Use Bordeaux mixture 

 or summer-strength lime-sulphur; or ammoniacal copper- 

 carbonate solution to avoid stains on foliage and flowers. 



The various diseases belong to two distinct classes. Most 

 of them are parasitical that is, the effect of the introduc- 

 tion and rapid multiplication of some injurious bacteria. 

 A few diseases seem to attack the whole plant system from 

 root to the tip; these are called "constitutional," and little 

 can be done against them except to keep the plants in vig- 

 orous growth and to destroy at once any plants infected. 



