พั�ลลภา กฤษณีไพับู ลย์�
chlorosis and stunting
seed gall
healthy seed
infected seed
Lesion root
Stubby root
Clinging root
relative large sphaerical gall
spindle shape gall
root tip gall
small warty elevated spots
HOW TO SAMPLE SOIL? 1 . Fallow field or area planted to cover
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HOW TO SAMPLE SOIL ? 2. Row crop
- take samples from feeder root zone in the row
HOW TO SAMPLE SOIL ? 3 .
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in the row
HOW TO SAMPLE SOIL ? 4 .Individual
tree sample plant