Articles
POPULATION FLUCTUATIONS OF RING NEMATODE (MESOCRICONEMA XENOPLAX) IN PRUNE ORCHARDS IN CALIFORNIA
Article number
985_31
Pages
241 – 247
Language
English
Abstract
Sampling of ring nematode for three years in five California prune orchards indicated that peak nematode numbers occurred during the summer at or shortly before harvest with a rapid decline thereafter.
Additional smaller peaks occurred in the winter and fall.
Samples were taken at soil depths of 0 to 30 cm and 30 to 60 cm.
The number of nematodes appeared to be greater at the 0 to 30 cm depth in the summer months with greater numbers being present at the 30 to 60 cm depth in the fall and winter.
Nematode numbers were lowest before irrigation and sharply increased after irrigation.
No differences in nematode recovery were evident between sampling with a shovel, a 5-cm diameter auger, or a 2.5-cm diameter tube.
The optimum strategy for sampling to determine if ring nematode is present in a prune orchard would be: 1) at a depth of 0 to 30 cm, 2) shortly after an irrigation,
3) between June and August, and 4) with either a shovel, an auger or a sampling tube.
Samples taken in the fall and winter were more likely to detect the presence of ring nematode if they were taken from 30 to 60 cm deep than at shallower depths.
Additional smaller peaks occurred in the winter and fall.
Samples were taken at soil depths of 0 to 30 cm and 30 to 60 cm.
The number of nematodes appeared to be greater at the 0 to 30 cm depth in the summer months with greater numbers being present at the 30 to 60 cm depth in the fall and winter.
Nematode numbers were lowest before irrigation and sharply increased after irrigation.
No differences in nematode recovery were evident between sampling with a shovel, a 5-cm diameter auger, or a 2.5-cm diameter tube.
The optimum strategy for sampling to determine if ring nematode is present in a prune orchard would be: 1) at a depth of 0 to 30 cm, 2) shortly after an irrigation,
3) between June and August, and 4) with either a shovel, an auger or a sampling tube.
Samples taken in the fall and winter were more likely to detect the presence of ring nematode if they were taken from 30 to 60 cm deep than at shallower depths.
Authors
B. Westerdahl, R.P. Buchner, J. Edstrom, W.H. Krueger, W. Olson
Keywords
: ring nematode, Mesocriconema xenoplax, prune
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