A Summary of Nematode Soil Sampling Results from the Indian River Area in 2010–2011
Soil samples containing feeder roots were collected at 212 locations in 2010 and 2011 from Martin, St. Lucie, Indian River, and Okeechobee counties. Representative samples containing four to six subsamples were taken in February through May or September through November from areas with declining trees in 31 groves. Assays were conducted for citrus (Tylenchulus semipenetrans), burrowing (Radopholus similis), dagger (Xiphinemaspp.), and sting (Belonolaimus longicaudatus) nematodes and evidence of root sloughing or fragmentation. Citrus nematodes were found in 47% (99) of the samples, with 10% (22) at population levels above 1,600 nematodes per 100 g of soil. Dagger nematodes were found in 54% (114) and sting nematodes in 14% (27) of the samples. No burrowing nematodes were detected in the samples. Root sloughing or fragmentation was noted in 34% (72) of the samples and sampled root weights were inversely related (P< 0.001) to numbers of dagger nematodes.