Controlling fanleaf virus…dagger nematode disease complex in vineyards by soil fumigation
High-rate, deep-placement applications of the soil fumigant, 1,3-D, have been successful over a 3-year test period in controlling both the nematode vector, Xiphinema index, and the fanleaf-yellow mosaic virus disease of grapevines. A 250-gal-per-acre application rate appears to be necessary, especially on heavy soils, until results of trials with lower rates have been evaluated. Recent commercial applications of methyl bromide under continuous polyethylene sheeting indicate a good potential for control of fanleaf virus-dagger nematode disease; however, preliminary tests show that shallow applications do not give satisfactory control in the deeper layers of soil. Further tests are underway to improve the effectiveness of this material.