International Journal of Nematology (2003) 13, 225-228

M.R. Khan and S.C. Bala (2003)
Morphometric variations in Hirschmanniella mucronata and H. oryzae from West Bengal
International Journal of Nematology 13 (2), 225-228
Abstract: Observation on different populations of Hirschmanniella mucronata and H. oryzae infecting rice in West Bengal revealed that the length of stylet in both the species was least variable (CV<5). The length of stylet varied between 21 µm to 25 µm in H. mucronata and 15 µm to 19 µm in H. oryzae. Therefore, the length of stylet is considered a good diagnostic character for differentiating these species. In H. mucronata, V percentage (44-53), c value and the position of excretory pore, junction of oesophagus-intestine from anterior end and tail length in female and length of spicule (27-32 µm), were found as moderately variable characters (CV<8). In H. oryzae, V percentage (50-57), c and b value, and position of excretory pore in female and the length of spicule (22-30 µm) were recorded as moderately variable characters (CV<8). These data show that: the two species can be easily separated on the basis of the stylet length, vulva percent position and spicule length.
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Database assignments for author(s): Matiyar Rahaman Khan

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
identification/taxonomy

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Hirschmanniella oryzae	Rice (Oryza)
	Hirschmanniella mucronata	Rice (Oryza)