Abuja Journal of Agriculture and Environment (AJAE)

IMPORTANT PARASITIC NEMATODES AND VECTORS OF DISEASES OF VEGETABLE CROPS (A REVIEW)
Author(s): Ubazi C. C., Asala S. W., Okafor, O.E.
Volume/Issue: Volume 1 , Issue 1 (2021)

ABSTRACT:

Plant-parasitic nematodes are ubiquitous residents of agricultural soil and important biotic factors in global vegetable production. This review discusses some important nematode parasite-vectors of diseases of vegetable crops, their significance in disease development and the limitations in assessing losses associated with nematode activities. Meloidogyne, Heterodera, Globodera, Pratylenchus, Hoplolaimus and Ditylenchus genera were some of the important parasitic nematodes affecting vegetables discussed. Plant-parasitic nematodes and the vectors may independently cause plant diseases by breaking through the pre-existing structural defence mechanism in plants through mechanical and enzymatic actions. Their interactions with secondary disease-causing agents (fungi, bacteria, and viruses) were also highlighted. There are limitations to the assessment of losses associated with nematode-related diseases under field circumstances due to farming systems, pre- and post-harvest activities, nematode diversity, population dynamics and incomplete harvest of some vegetables which serve as hideouts for these nematodes. The role of nematodes in the soil field of vegetable crops may not be appreciated without consideration to factors such as host-parasite interaction, life cycle and distribution and nematode’s role in crop diseases development. It is therefore worthy of scientific attention in this regard to further establish the certainty of disease development in vegetables in the absence of nematode activities. These factors remain a huge challenge to plant pathologists in understanding the minutiae surrounding production and economics of vegetable crops. Therefore, further research effort in this regard can be of advantage to global vegetable economy.

KEYWORDS:

Yield attributes, Extra-early maize varieties, Herbicides