8 



to use an increased amount of the arsenate of lead to overcome 

 this reduced efficiency rather than to make two separate 

 sprayings. 



Bordeaux mixture, lead arsenate and nicotine sulphate may 

 be combined with safety, but soap should never be added to 

 this mixture. 



Application of Insecticides. 



Insecticides are applied either in a dry form or as a spray. 

 For the application of the former, dusters, sold by seedsmen, 

 are useful, or the powders may be dusted over the plants from 

 bags made of cheesecloth. Dry powders are best applied when 

 the leaves are wet with dew or immediately after a light rain. 

 For applying liquid insecticides a spraying apparatus is neces- 

 sary. If spraying is to be conducted on a rather large scale, 

 a power or barrel sprayer will be found most satisfactory, but 

 if only a small area is to be treated a compressed-air sprayer 

 or knapsack pump is most convenient. Bucket pumps or 

 sprayers are useful for spraAing small gardens, but two persons 

 are required to operate them. Regardless of the type of 

 pump used, a 3 or 4 foot extension rod with an angle, under- 

 spray nozzle is essential for successful garden spraying. The 

 angle disc nozzle has proved most satisfactory for all-round 

 garden work. 



Insecticides should be applied to prevent injury, and treat- 

 ment should always be prompt. Thorough application of 

 spray material is essential for success in insect control. In 

 applying stomach poisons aim to cover all portions of the plant 

 liable to be fed upon, and when using contact insecticides 

 strive to hit every insect attacking the plants. 



INSECTS OF THE VEGETABLE GARDEN. 



Injurious garden insects may be roughly classified, from the 

 standpoint of their food plants, into two divisions. First, 

 those which are general feeders, or insects which are not par- 

 ticular as to their food plants. These include cutworms and 

 other caterpillars, leaf beetles, thrips, some plant lice and 

 others. Second, those known as special or selective feeders, 

 that is, insects which ordinarily attack only a single crop, or 



