234 Diseases of Truck Crops 



Leaf 40," used at the rate of one part to one thousand 

 of water. This will control the aphids. "Black 

 Leaf 40" readily mixes with Bordeaux mixture. To 

 control both fungus and plant lice, add to every one 

 hundred gallons of Bordeaux one pint of "Black 

 Leaf 40." To control chewing insects, such as the 

 cucumber striped beetle or caterpillars feeding on 

 the plants, add to each one hundred gallons of Bor- 

 deaux three pounds of powdered arsenate of lead. 



DISEASES OF THE CITRON (CitruUus vulgaris) 



Citrons are not grown commercially. They are 

 found as weeds in melon patches or anywhere in the 

 farm where permitted. The citron is a very hardy 

 plant, and it is subject to but few diseases. 



Anthracnose, see Watermelon, p. 240. 



Leaf Spot, see Watermelon, p. 243. 



Gourd Disease, see Squash, p. 234. 



Muskmelon Diseases, see Cantaloupes, p. 219. 



Pumpkin Diseases, see Squash, p. 234. 



DISEASES OF THE SQUASH (Cucurbita 

 maxima, C. pepo, and C. Moschata) 



Squashes, with but few exceptions, are subject to 

 the same diseases as affect the cantaloupe and the cu- 

 cumber. Squashes are usually grown for local mar- 

 kets, and because of their diseases in many places 

 their culture has been abandoned. 



Bacterial Wilt, see Cucumber, p. 229. 



