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The use of dazomet as a fall and spring fumigant for pine seedling production and control of soi lborne pests was evaluated at two southern nurseries . Dazomet was appl ied at low (280-325 kg/ha) and high (493-560 kg/ha) rates and incorporated wi th a rotot i l ler or spading machine. Comparisons were made wi th methyl bromide/chloropicrin (MBC)fumigat ion and nonfumigated control treatments . Dazomet incorporat ion method had no effect on seedling density at either nursery, and often did not affect seedling morphological characteris t ics . At the Georgia (GA) nursery, seedl ing densi ty and morphological characteris t ics did not differ among fumigant treatments except in the spring study area where shoot weight was greater in the MBC treatment than the dazomet or nonfumigated control treatments . In the s tudy area a t the North Carol ina (NC) nursery, seedl ing densi ty was greater in the high-rate dazomet treatment than the nonfumigated control . Seedlings were generally larger in MBC and dazomet treatments than the control. Seedling density and morphological character is t ics did not differ amongfumigat ion treatments in the spring s tudy area. Fumigat ion wi th A4BC or dazomet generally reduced the percentage of roo t s w i th Pyth ium and Fusar ium spp. compared to controls at the GA nursery and the fal l fumigat ion area in the NC nursery . Plant parasi t ic nematodes were found infrequently at both nurseries and did not difSer among treatments. Nutsedge (Cyperus spp.) was the major problem at the GA nursery and was effectively controlled only with MBC. Compared to the MBC treatment, the abundance of soi lborne fungi and the associat ion of certain types of’lkichoderma wi th roo t s was ofren lower in the dazomet treatments . The importance of these dif ferences for long term seedl ing product ion and management of soi lborne diseases is not known at this t ime. South. J . Appl . For. 27(1):41-51.

An Evaluation of Dazomet Incorporation Methods on Soilborne Organisms and Pine Seedling Production in Southern Nurseries