an air-tight plastic seal over the field and have not been used ex- 

 tensively because of the expense and need for specialized applica- 

 tion equipment. 



Chemical (Brand Name) Remarks 



ethylene dibromide Preplant fumigants used primarily 



(Dowfume W-8 5*, Dow Ethylene for nematode control. 

 Dibromide*) 

 dichloropropene - dichloropro- 



pane mixture 



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

 dichloropropene 



(Telone*) 



dichloropropene mixture plus Lowest rates recommended by manu- 



methyl isothiocyanate facturer give primarily nematode 



(Vorlex*) control. Increased dosages give 



dichloropropene mixture plus additional soil fungus and weed 



chloropicrin control. 

 (DD-Pic*, Vidden DC-15*, 

 Telone C) 



A final word should be added about the importance of clean 

 plants. It does no good to fumigate soil if disease organisms are 

 immediately added back to the soil with the roots of new plants. 

 The use of healthy-appearing planting stock from a reliabel source 

 is the best insurance against this. 



CONTROLLING FRUIT FLIES AT ROADSIDE STANDS 



G.L. Jensen 

 Department of Entomology 



Adult fruit flies (Drosophila or vinegar flies) are very small 

 (less than 1/8 inch long) , have bright red eyes and a tan-colored 

 head and thorax, with a blackish abdomen. They are found every- 

 where in the world, and are very common wherever fruit and similar 

 materials are permitted to rot and ferment. The entire life cycle 

 of the flies can be completed in as little as 8 to 10 days, hence 

 large populations can build up in only a few weeks. 



To control these pests, one should eliminate as much as possi- 

 ble all rotting fruits, vegetables and liquids containing food par- 

 ticles from the premises. The flies can breed in almost anything 

 that contains garbage, even such things as dish water from sinks. 



