RECOMMENDATIONS FOR CONTROL OF CABBAGE MAGGOT 



1. Destroy all "stumps" and roots of cruciferous crops either by pulling or by 

 plowing as soon as the crop is harvested. This applies especially to fall 

 crops, which are the principal source of the flies in the spring. 



2. Plant cabbage and other susceptible crops as far from a previous planting 

 as practical. The flies migrate, but an infestation is delayed by rotation 

 with non-susceptible crops. 



3. On seedlings in the seedbed or cold frame from May 5 to 30, or from June 

 10 to 30, use one of the following treatments: 



a. Cover with 20 to 30 mesh cheesecloth. 



b. Apply corrosive sublimate solution 1-1920 (1 ounce in 15 gallons of 

 water). Make TWO OR THREE applications 7 days apart, using 1 

 gallon on 40 to 50 feet of row." If the infestation is very heavy, use a 

 1-1280 solution (1 ounce in 10 gallons of water) in the same way. 



4. On early transplants in the field, use one of the following treatments: 



a. When a heavy infestation is expected: 



Apply corrosive sublimate solution 1-1280 (1 ounce in 10 gallons of 

 water) at the rate of 3^ cupful per plant, making TWO applications 

 at weekly intervals beginning when the first eggs are laid (May 5 to 

 10 at Waltham). 



OR: Apply calomel-talc dust (4 percent calomel) in a mound around 

 the stem of the plant, using 1 teaspoonful per plant, before the first 

 eggs are laid. 



b. When a moderate or light infestation is expected: 



Apph' corrosive sublimate solution 1-1920 (1 ounce in 15 gallons of 

 water) making TWO applications as in 4-a above. 

 OR: Apply corrosive sublimate solution 1-1280 (1 ounce in 10 gallons 

 of water), using J^ cupful per plant and making ONE application 

 about 1 week after the first eggs are laid. 



OR: Apply calomel-talc dust (2 percent calomel) in a mound around 

 the stem of the plant, using 1 teaspoonful per plant before the first 

 eggs are laid. 



OR: Apply calomel-talc dust (4 percent calomel) directed at the 

 base of the plant with a hand duster, making THREE applications 

 at weekly intervals beginning when the first eggs are laid. 



c. On transplants without soil on roots, especially southern-grown plants, 

 moisten roots and dust stems and roots with calomel-talc dust con- 

 taining 50 percent calomel just before transplanting. 



d. In the home garden, apply a tar paper disc around the stem of each 

 plant when the plants are transplanted. 



5. Compare the cost of these treatments as shown in Table 13, page 24. 



