Nematode Population Growth Research Articles

Modelling nematode population growth and damage

Recent results on the population dynamics and damage relationships of root-knot nematode (RKN, Meloidogyne incognita) and of potato cyst nematode (PCN, Globodera pallida) are modelled, and a computer-based programme is used to explore different strategies for PCN control. Damage by RKN was shown to be density dependent, to increase with increasing duration of plant growth, and to be much greater for good than poor hosts. PCN populations both increase and decline more slowly than those of RKN, and modelling suggested that, when non-hosts are grown, differences in decline rates will have an accumulative effect on the effectiveness of rotation. Similarly, differences in nematicide effectiveness will have a major effect on post-harvest PCN populations, and nematicides were shown to be most effective when PCN populations are small. Host resistance is a key component of integrated management of nematodes and, because gene flow in soil is limited, it can be durable.

Nematode population growth and disease development in the pine wilting disease

AbstractThe pine wilting disease prevalent in western Japan was studied with respect to the pine wood nematode, Bursaphelenchus lignicolus, as a causal agent. The relationship between the behavior of nematode populations within pines and disease development is discussed.

Influence of water stress on development of pine wilting disease caused by Bursaphelenchus lignicolus

In the development of pine wilting disease caused by Bursaphelenchus lignicolus, water status in pines plays an important role in the pinenematode relationship. Levelling off in transpiration causes a population growth of nematodes in the wood. Such pines invariably wilt several weeks after the reduction of transpiration. The paper contains details of oleoresin exudation, transpiration and xylem water potential as well as the nematode population in the wood in connection with disease development.