CHAPTER X. 



INSECTS 



Aphis The black and green aphis infest chrysanthemums in all 

 stages of their development and are very persistent in their depredations. 

 The best remedy for the amateur who grow their plants out-of-doors 

 is to apply one of the several forms of tobacco extract, such as Nico- 

 Furne, To-Bak-Ine, etc., which can be purchased of any of the large sup- 

 ply houses in quantities to suit the need with directions for its use. This- 

 is diluted and applied with a spray pump. Hammond's Thrip Juice Xo. 

 2, recommended for Thrip, will keep the plants very clean and is applied 

 the same way. 



Tobacco dust is often useful when only a few plants are effected, and 

 is applied dry after the foliage has been wet so it will adhere. 



Those who devote 

 a considerable area 

 to chrystanthemums 

 under glass will find 

 an easier way to 

 eradicate aphis is by 

 the use/ of tobacco 

 stems as a fumigant 

 or by using Hydor- 

 cyanic Acid Gas. 



If tobacco stem* 

 are used it is neces- 

 sary to dampen them 

 a few hours ahead 

 so they will burn 

 slowly and prevent 

 blazing, which gen- 

 erates heat and gas 

 that often burns tiio 

 foliage. Some prefer 

 tobacco dust or a 

 manufactured article 

 called Tobacco Punk, 

 which is strips o p 

 paper saturated with 

 nicotine. Both of 

 these burn slowly 

 and are very satis- 

 factory. 



In fumigating with 



tobacco there is less danger of burning the tender tips if the foliage is wet 

 and with Cyanide it should be dry, so avoid spraying late in the day it 

 is to be used. 



Chrysanthemum Midge The chrysanthemum midge, or gall fly, as 

 known among entomologists, is Diarthronomya hypogea H. Lw. It was 



FIG. 21. CHRYSANTHEMUM SHOWING GALLS. 



