Tag Archives: Root Knot nematode

Veris Soil Mapping System

Last week the AZAG newsletter featured a short publication on Sampling Soil for Root Knot Nematode in Cotton. One aspect of RKN incidence is that its distribution is associated with the higher percentage of sand in the sandy or sandy loam soils. Veris survey is a technique that can quantify the variability in the soil texture. The technique is based on measuring the electric conductivity in the soil that can give direct relationship to the soil texture. Data obtained from Veris survey can be used to develop a soil texture map of the field that shows color coded areas with higher percentage of sand. This map can precisely target sampling sandy areas where RKN is more likely to occur. It can also help direct nematicide applications to manage RKN in these sandy areas in the field. For more information on Veris soil mapping system and directed soil sampling click here for this short video.

Root Knot Nematode

The Root-knot nematode (RKN), Meloidogyne incognita, is a serious pest that infects cotton as well as sorghum, corn, melons, watermelon, peppers, beans, and many other crops. The RKN is usually found in sandy or sandy loam soils; and is most active in the summer when soil temperatures are warm. This parasitic nematode is an obligate parasite that must complete its life cycle in a plant host, but eggs are persistent and can remain inactive in the absence of a host and/or in fallow fields for months or years. Infection of RKN causes swellings (galls) on the roots. In cotton, these swellings are usually small and hard to detect. As a result, plants may be heavily infected even though galls are not easily visible. Accurate diagnosis of RKN infestation usually requires laboratory analysis for detection and identification. Good samples are important for accurate identification and quantification.
Click Here for a short publication on Sampling Soil for Root Knot Nematode, which contains steps to help ensure you get a good sample.