174 



INJURIOUS INSECTS OF 1904. 



with thirty parts of water. Dilute with 35 parts of water when 

 used against radish maggots. About one-half pint of this emulsion 

 should be poured about the base of each cabbage plant. The 

 recipe for kerosene emulsion is given in Report for 1903 (Bulletin 

 84). Against the radish maggot the writer has successfuU}' used, 

 in a small garden, tobacco water making several applications with 

 a watering pot, beginning when the radishes were quite young. 

 The tobacco solution not only acts as a repellant, but is also an 

 excellent fertilizer. He has also used ashes and slaked lime. 



We note that when radishes are raised on a large scale the fol- 

 lowing compound is recommended (J. B. S.) : XHtrate of soda 700 

 lbs., ground rock 1,000 lbs., muriate of potash 300 lbs. This 

 should be applied at the rate of 500 lbs. to the acre, sown after 

 plants are up, "when the leaves are about an inch long" and should 

 be used during or before a rain. Applied too late, after the insects 

 have got into the roots, it would be a waste of time and money as 

 far as a remedv against the maggots Avas concerned. 



Fig. 16354. — Onion Maggot. 



Cabbage Worm: This green worm, the larva of the white 

 cabbage butterfly, not only attacks cabbage, cauliflower, kale, etc.. 

 but various kinds of cruciferous plants. We believe in paying 

 children something to hand pick the worms and kill them, and also 

 to make nets of mos(|uito bar in the early summer and catch. every 

 white butterfly they see hovering over the cabbages. A small sum 



