10 



Remedies : Spray with Paris green, using one pound of Paris green 

 to every ioo gallons of water, and adding a little hard or soft soap to 

 prevent the liquid rolling off the cabbage leaves ; hellebore dusted over the 

 cabbage leaves in early morning. 



Hellebore is poisonous to insects, although harmless to man. It is 

 more expensive than Paris green. 



Cabbage-Root Maggot (Phorbia brassicce) : This pest is well known 

 to the vegetable growers of Ontario. The eggs are laid by a small fly in 

 the soil near the root of the cabbage. In two or three days the eggs 

 hatch, and the small white maggots find their way to the root of the cab- 

 bage or cauliflower. The young maggot tunnels into the root and the 

 affected plant soon withers and dies. 



The winter is passed, for the most part, in the pupal condition. 



Remedies : Carbolic acid emulsion (diluted about thirty times with 

 water) using one-half teacupful to each plant and pouring it about the 

 root with a sprinkler the day after setting and repeated every ten days, 

 until the end of May ; tobacco dust placed around the stem of the plant ; 

 pads of tarred paper about 2 and z\ inches in diameter, placed about the 

 plants shortly after setting time ; destroy diseased plants. 



The Diamond-back Moth : a, caterpillar ; d, pupa ; e, cocoon ; 



/, moth — enlarged. 



Diamond Back Moth (Plutella macidipennis) : Small green-colored 

 caterpillars, about three-eighths of an inch in length. When disturbed 

 they wriggle about and fall to the ground. Their presence is easily 

 detected by the numerous small holes eaten through the leaf. The larval 

 stage lasts about a month, and then they spin small cocoons on the under 

 side of the leaf. About two weeks later the adult moth emerges. There 

 are, at least, two broods in a season. 



Remedies : Dust or spray the infected plants with the usual Paris 

 green mixtures or solutions, as for Cabbage-worm. Induce vigorous 

 growth by light dressings of nitrate of soda. 



