16 ' THE CABBAGE MAGGOT. 



repellant after setting. This treatment was fatal to the 

 plants. It also injured radishes, tho many survived and pro- 

 duced 70 per cent of marketable roots. 



Acetate of Lead: 4 oz. in >S pint of water, and plants 

 dipped. All killed by this treatment. 



Napthaline (MotJi Balls): Following a suggestion from 

 New York (not made by an entomologist), two moth balls 

 were planted close to each of several plants. The experiment 

 was not extended enough to warrant conclusions, beyond the 

 fact that such treatment does not appear practicable. 



Field Experiments included under Series II began June 

 23rd, and the late set cauliflower plants, radishes and cabbages 

 were made use of. As intimated above, the maggots were 

 not bad late in the season and the cauliflower headed poorly ; 

 hence results obtained ^vere not conclusive, and need not be 

 reported here. A few of the later experiments have been 

 listed above. 



In addition to the above, additional field trials were made as 

 follows : On May 28th sixteen cauliflower plants and sixteen 

 cabbage plants were treated with 1-30 carbolic emulsion, about 

 ^ coffee cup full being poured around each plant. The 

 ground was soaked about the base of each plant, and remained 

 wet with the solution for at least fifteen minutes. Check rows 

 were left for comparison. On June 5th the sixteen plants 

 treated on May 28th were examined ; results, fifty-eight mag- 

 gots found in the plants, one plant containing thirteen. On 

 June 7th sixteen untreated or check cauliflower plants were 

 examined; results, eighty-two maggots, one plant having 

 thirty worms in or on its stem. This showing favors some- 

 what the use of carbolic emulsion, 75 per cent of the treated 

 plants being affected as against 88 per cent of the untreated. 

 A 1-20 solution of carbolic emulsion, or even a 1-30 solution 

 appears to affect very young plants unfavorably, and should 

 be used with caution. 



Eifect of Location: On June i6th an assistant visited a 

 market garden where some of the cabbages, as well as turnips 

 and radishes had been planted in a sheltered position (near a 

 wood), and others where they got the breeze. He reported 

 as follows : "Conditions are such here as to show very plainly 

 the effect of planting in exposed places. Mr. B.'s turnips and 

 cabbages are pretty well protected from the south and west, 

 the turnips very much so. As we get away from the shelter- 



