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Rating of Population Levels of the Citrus Nematode Larvae and Females
as Determined by Soil Analysis (1)
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LARVAE
per 500 g soil |
FEMALES
per 1 g roots |
Population level |
Feb-Apr |
May-July |
Feb-Apr |
May-June |
|
low |
<2000 |
<4000 |
<100 |
<300 |
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medium |
>5000 |
>8000 |
>400 |
>700 |
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high |
>12,000 |
>18,000 |
>1100 |
>1400 |
(1) Samples taken at 60 cm (2 ft.) depth with Viehmeyer tube,
extraction with Baermann funnel; nematode numbers adjusted
to 100% extraction efficiency; < = less than, > = greater
than. One gram (g) of soil equals approximately 1 cc, but
varies with soil moisture.
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