Control AsS 



In general, D-D, Telone, EDB, or l,2-dibromo-3-chloropropane will be 

 used for large scale work on soils to be planted to crops of fairly 

 high value. Seedbeds or other small areas will be fumigated with 

 methyl bromide, chloropicrin, Vapam, or >tylone where the broader lethal 

 spectrum of a soil sterilant is desired. In greenhouses, methylbromide 

 or chloropicrin will be used, though use of the latter should be avoided 

 in greenhouses where plants are growing, since small concentrations in 

 the air are highly poisonous to plants. 



In case of doubt, it is well to inquire of the manufacturer before using 

 nematocides. If informed of the exact circumstances possible hazards 

 to avoid will be pointed out. Exact descriptions of methods are also 

 best obtained from the literature of manufacturers of soil fiamigants and 

 applicators. Discussion here will be confined to generalities. 



Improvised equipment can be used for small jobs. Perhaps the easiest 

 way is to use a fruit jar with two nail holes punched in the lid, one 

 for the fumigant to run out, the other to admit air. The fumigant is 

 poured from the jar into an open furrow which is promptly covered. 

 Dosage is adjusted by trial and error, changing size of nail hole until 

 the proper amount is delivered at a steady walking pace. The availa- 

 bility now of water soluble materials, emulsifiable formulations, wet- 

 table powders, and impregnated granular carriers open up a wide range 

 of simple methods of application of the chemicals. The chart on the 

 following page illustrates various methods s\Ji table for treating small 

 areas of soil. 



If commercial fumigation of small areas is a job which has to be done 

 often, as in a greenhouse or nursery, a hand applicator or injector may 

 be a good investment. Where topical applications may be preferred, a 

 rotory tillage device is recommended and can be rigged for distribution 

 of the chemicals at the time of tilling them thoroughly into the soil. 



For work involving greater area, it is usually best to use some sort 

 of continuous flow applicator. These can be made in any size desired, 

 from a single shank on a garden tractor to six br eight shanks on a 

 regular farm tractor. Kits of parts to make a machine for delivery of 

 liquids are readily available, and regular distributor devices for 

 granular insecticides and fertilizers are available, or such equipment 

 on hand may be adapted. No matter what the size of the machine, it 

 must be capable of delivering accurately measured amounts of the chemi- 

 cal and placing them usually at a depth of at least six to eight inches. 



In all fumigation jobs, except for experimental work, the manufacturers' 

 directions should be followed exactly. Read the label and any circular 

 you can get. Observe all safety precautions. It is also an excellent 

 idea to observe procedures used by others in your area. 



