17 



These are produced by a fungus called Corn Smut. The growths are 

 filled with black spores, which rest over winter, germinate in the spring, 

 and produce multitudes of secondary spores. These are carried by the 

 wind to new corn plants, which become infected. It has been shown 

 that only young parts of the corn plant can be infected and attacked. 



a^CE* 



WlEEWORMS (7, 8, 9) 



pupa (10)— enlarged; click-beetles (5— natural size; 

 2, 3, 6— enlarged). {Curtis.) 



Treatment : Avoid fresh manure ; remove and burn all the smut 

 growths as soon as discovered. Seed treatment is not effective. 



Rust (Puccinia sorghi) : Reddish or blackish elongated pustles 

 occur on both sides of the leaf. The injury is not often serious. 



Cucumber. 



(Insects). 



Striped Cucumber-Beetle (Diabrotica vittata) : This beetle is well 

 known to the vegetable grower. It is light yellow, with four black lines 

 down the back, and is a little more than two-fifths of an inch in length. 

 The eggs are laid on the stems just below the surface, and when hatched 

 bore into the stem or root. The winter is passed in the adult stage, under 

 any rubbish which will afford shelter. In the spring, as soon as the 

 young cucumbers appear above the ground, the beetles leave their hiber- 

 nating quarters and devour the foliage of the seedlings. It feeds also 

 upon the squash and melon, and is a very difficult insect to overcome. 



Remedies : Spray with arsenical Bordeaux as soon as plants appear 

 above ground, and repeat ten days later; dust the young plants with 

 Paris green, and land plaster, ashes or lime (one to fifty), or with dr; 

 slakedlime and sulphur, and repeat ten days later ; keep the young vines 

 covered with cheese-cloth, fixed to frames; clean up refuse in the fall. 



Squash-Bug (Anasa tristis) : The adult insect is a rusty-brown, flat 

 bug, yellow on the under side. It is about three-fifths of an inch in length 



2 BULL. 150 



