The dagger nematode is also common and is capable of transmitting yellow bud mosaic virus to almond trees. Nemaguard peach rootstock, almond-nemaguard hybrids, and Marianna 2624, which are resistant or immune to most common and injurious root knot nematodes, are susceptible to ring nematode and root lesion nematode, common pests in old orchard and vineyard soils. Lovell peach rootstock is susceptible to ring, root knot, and root lesion nematodes.
Almond rootstock is rated susceptible to root knot, root lesion, and ring nematodes.
Use of resistant rootstocks may be limited by soil and horticultural considerations. When planting or replanting an orchard, be sure to sample for nematodes, especially if the land was previously an orchard or a vineyard. Remove trees or vines, destroy residues, and deep cultivate to remove residual roots and break up cultivation pans or soil layering. Dry the soil. You may need to apply an inch of water to break surface clods.