376 Diseases of Greenhouse Crops 



planting the regular crop. The larvae will feed on 

 the poisonous com kernels and die. Another way is 

 to treat the seed with gas (coal) tar. 



White grubs may be controlled by the use of bi- 

 sulphide of carbon. 



Cutworms may be controlled by the use of a poi- 

 soned bran made as follows : to three ounces of mo- 

 lasses add one gallon of water and sufficient bran 

 to make a fairly stiffened mixture. To this add 

 Paris green or arsenic and stir well into a paste. A 

 heaping teaspoonful of the mixture is scattered here 

 and there over the infested beds. 



Ants 



Ants are often troublesome in the greenhouse. 

 These may feed on germinating seed or on growing 

 tips of tender plants. A more pernicious habit is the 

 care and protection which they afford to plant lice 

 and mealy bugs. 



Control. Ants may be controlled by being fed 

 with a poisoned bait prepared as follows: To yj^ 

 pints of water add one-fourth of an ounce of tartaric 

 acid (crystals), 15 pounds of granulated sugar. Boil 

 this mixture slowly for 30 minutes and allow it to 

 cool. Then slowly dissolve three-fourths of an 

 ounce of sodium arsenate in one-half pint of hot 

 water and allow it to cool. After this is well stirred 

 into the sirup above mentioned, add one and a half 

 pounds of pure honey. This mixture may now be 

 sprayed on paper or boards on the beds. The ants 



