Final diagnosis


Brown root rot (Pratylenchus spp. )

Stunted tobacco seedlings with reddish brown roots. <i><b>Pratylenchus crenatus </b></i>(lesion nematodes)
The attacks often occur early; such as in this root system which has its eldest part completely rotten. <i><b>Pratylenchus</b></i> spp. (lesion nematodes)
The roots often show a dark brown to black rot which can be confused with that caused by <i>Thielaviopsis basicola</i>.<i><b> Pratylenchus </b></i>spp. (lesion nematodes)
The roots are rotten in different degrees and show a reddish brown colour. <i><b>Pratylenchus </b></i>sp. (lesion nematodes)
In the cortex of the roots of diseased plants, one can often observe the presence of adults, larvae and eggs of these migratory endoparasitic nematodes. <b><i>Pratylenchus</i> </b>spp. (lesion nematodes)
<i><b>Pratylenchus</b></i> spp. (lesion nematodes) nematodes are short with a visible stylet.