416 Report of the Department of Entomology of thb 



Tablk III. — Yields of Cabbage from Treated and Untreated Rows on the 



Baker Farm in 1913. 



From the above table it will be observed that 72 per ct. of the 

 cabbages protected with tar pads were sold on the early market 

 as compared with about 19 per ct. of the plants not treated. By- 

 computing the gain per 1,000 plants, on the basis of the above 

 experiment, we secure the following results: 



1,000 protected plants yield 723 marketable heads. 



1,000 check plants yield 193 marketable heads. 



Gain due to tar pads 530 heads. 



The above mentioned cabbage was sold at 8^ cents per head. 



Value of 530 heads at 8$ cents $44 . 17 



Cost of protecting 1,000 plants with tarred 



papers 1 . 40 



Net profit per 1,000 protected plants $42.77 



Conclusions from experiments with tar pads. — The experiments 

 briefly described have shown that the employment of tar pads is 

 an efficient method of reducing losses to early cabbage from maggots. 

 The actual amount of protection secured by this means has varied 

 with different farms according to the severity of the attacks by this 

 pest, but in plantings where the maggots were abundant and very 



