IS 



on the dirt beyond it. If laid beyond the card, the maggots, when 

 they hatch, will be nnable to reach the plant, and if laid on the card 

 they Avill almost inevitably dry ont before the larva? develop. Such 

 larvae as may develop will be nnalde to penetrate the tongh skin of 

 the stem above the surface. 



The cards can be easily and cheaply made at odd times and can 

 be quickly and readily applied Avhen setting plants, so that the 

 method is well Avorth trying. Large growers in Xew York State 

 who have used thousands of the cards have done so with marked 

 success, but in Alinnesota, on account of different methods of 

 culture, thev have been less successful. 



Carbolic Add and liime. 



In our exjDerimental work last season this proved to be the 

 most effective material tested. It Avas used by Mr. L. A. Steniler 

 on his onion patch and appeared to act as a preventive and a 

 repellant. The method of application and the conditions under 

 which it was used are as follows : The patch where the applica- 

 tions were made was situated near a previously infested plot. 

 One application of carbolic emulsion — considered on a succeeding 

 page — was made over the rows before the plants were al)0ve 

 ground, after which a mixture of crude carbolic acid and lime 

 was applied once a week. The application, made with a sprink- 

 ling can or a spray nozzle, was very thorough, so that the material 

 formed a crust on the ground around the plants, and the odor of 

 the acid was perceptible for several days thereafter. That the 

 material acted as a repellant seems probable because even the un- 

 treated check rows showed a very slight infestation, while the 

 treated plants suffered scarcely at all, and this is significant, in 

 view of the fact that the plants of the surrounding neighbors all 

 suffered to a considerable extent. 



The method of making the material is : Slake the lime to a thin 

 cream, use three pints to a gallon of Avater, and to this add one table- 

 spoonful of crude carbolic acid. Apply along the rows as already 

 mentioned, getting it well around the plants, so that the surface 

 will be coated to the plants. It may be used on all kinds of plants 

 subject to maggot attack, and the theory of its action is exactly 

 like that of the tarred cards. It forms a covering through which 



