Should I fumigate? Each field has its own set of conditions, 

 and whether or not disease organisms build up to a point where 

 they cause trouble is largely a matter of crop sequence, tempera- 

 ture, moisture, organic matter, and a host of unknowns. Many of 

 these unknowns will also determine whether or not a chemical treat- 

 ment will work. Poor growth of plants will lead you to suspect a 

 problem, a soil test may confirm that a nematode problem is pres- 

 ent, and a trial application of chemical may lead to better growth 



What can be used? 



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Chemi cal : (Brands ) 



Listed below are fumigants registered for 

 All are liquids that are injected into soil 

 become gases that diffuse through all parts 



re are a number of factors that can influ- 



ss: organic matter absorbs th"ese fumes; soil 

 and prevents their spread; and at low tem- 



anisms are very resistant to toxic fumes. 



oup of pesticides, fumigants must be applied 

 directions. Unless the soil temperature, 

 organic matter are right, and the proper 



deposited at the right depth and is sealed 



e treatment may be useless. 



Remarks 



ethylene dibromide 



(Dowfume W-85*) 



Preplant fumigants used primar- 

 ily for nematode control. 



dichloropropene - dichloropro- 



pane mixture 



(Shell D-D*, Vidden-D*) 

 dichloropropene 



(Tel one*) 



dichloropropene mixture plus 

 methyl i sothi ocyanate 

 (Vorlex*) 



Lowest rates recommended by man- 

 ufacturer give primarily nematode 

 control. Increased dosages give 

 additional soil fungus and weed 

 control . 



Companies which manufacture soil chemicals can supply detailed 

 information on application equipment. In addition, custom appli- 

 cators are available who will not only apply treatments, but can 

 give advice based on their rather wide experience. 



The chemicals listed above are those generally in use. In 

 addition, your regional specialist can supply you with the names of 

 others that may be of use under special conditions. One of these 

 is DBCP (Nemagon*, Fumazone*), a fumigant which does not injure 

 strawberries at low rates and can be used on growing plants. 



± ^ 



Trade name 



