2 THE CABBAGE MAGGOT. 



SUMMARY OF RESULTS OF SEASON'S WORK. 



1 Fields exposed to breeze, and where all old stalks of 

 preceding year in the neighborhood were plowed under 

 last fall, have been much less affected than fields not 

 so located, and not so fortunate as regards clean culti- 

 vation. Plants in sandy soil appear to suffer more, other 

 things being equal, than those planted in heavy soil. 



2. Measures tending to prevent the maggot attacking the 

 stem would appear more practical than a "cure" (carbolic 

 emulsion, etc.) after the pest is in or on the stem below 

 the surface of the ground. 



'6. We need another year's experimentation, in order to use 

 on the early crop of cauliflower methods which this 

 year's work leads us to believe will be efficacious. 



4. Cultural methods may possibly prove our best means to 



control the maggot. 



5. Natural enemies help us in this fight. Several ground 

 beetles, p. 8, a red mite which sucks the eggs, p. 8 and 

 various parasitic insects, p. 8. See also colored plate. 



6. Young maggots lived in the laboratory for two hours 

 and twenty minutes immersed in carbolic emulsion (1 

 part to 30 of water), and adult maggots required three 

 hours and forty minutes of such immersion before dying, 

 p. 6. Some eggs hatched after thirty seconds' treat- 

 ment with carbolic emulsion of the same strength. 



7. Good results were obtained by immersirg the roots at time 

 of setting with hellebore and water (p. 12), and also by 

 the use cf bran and glue and sawdust and glue (pp. 12 

 and 13). 



8. Flies under observation laid fertilized eggs in captivity, 

 b Length of life of cg^', 3 to 5 days (p. 5). 



c. Length of life of maggot, about 21 days (p. 6). 



d. Duration cf pupal sta^^e, first brood, 13 to 15 days 



(p. V). 



