Epidemiology of vectored plant pathogens involves the plant, the pathogens, the vectors, and the environment, all interacting in various ways. Often, an understanding is needed of seasonal cycles of host plants, pathogens, and vectors. For example, pathogens and vectors important to an annual crop may have non-crop reservoirs between harvest and re-planting. Vectors may overwinter in the crop, ...

Detectable polymorphism of host resistance and parasite host range is a poor guide to the specificity of a host-parasite interaction. I analyse a simple haploid model to support this claim. The model assumes that the true specificity is 'matching-allele', in which each of n host alleles causes resistance to only one of n different parasite alleles. The detectable polymorphism in samples from a ...

The co-evolution of bacterial plant pathogens and their hosts is a complex and dynamic process. Host resistance imposes stress on invading pathogens that can lead to changes in the bacterial genome enabling the pathogen to escape host resistance. We have observed this phenomenon with the plant pathogen Pseudomonas syringae pv. phaseolicola where isolates that have lost the genomic island PPHGI-...

I show that detectable polymorphism of host resistance and parasite host-range is a poor guide to the specificity of a host-parasite interaction. I analyze a simple haploid model to support this claim. The model assumes that the true specificity is " matching-allele " in which each of n host alleles causes resistance to only one of n different parasite alleles. The detectable polymorphism in sa...

“Pathogen effector” has been increasingly used in the past decades in the plant-pathogen interactions (Hogenhout et al., 2009).Presently, the definition of pathogen effector commonly adopted the definition given by Sophien Kamoun, that is, effectors are ‘molecules that manipulate host cell structure and function, thereby facilitating infection (virulence factors or toxins) and/or triggering def...

the effect of various host plants including chickpea (varieties arman, hashem, azad and binivich), common bean (variety khomein), white kidney bean (variety dehghan), red kidney bean (variety goli), cowpea (variety mashhad), and tomato (variety meshkin) on the reproductive performance and growth indices of the cotton bollworm, helicoverpa armigera (hübner) was determined under laboratory condit...

! Abstract Novel plant-pathogen combinations occur whenever pathogen or plant species are introduced to regions outside their native range. Whether a pathogen is able to acquire a new host depends on the genetic compatibility between the two, through either preadaptation of the pathogen or subsequent evolutionary change. The ecological outcome of the novel interaction—for example, a spreading d...

In general, a plant resistant to nematodes resists attack or exhibits little damage and reduces nematode populations. The following four types of resistance may be distinguished: (i) The plant may produce toxins that kill the nematodes; e.g., Asparagus officinalis contains in its stems, leaves and roots a glycoside toxic to Trichodorus christiei, and populations of this nematode rapidly decline...

Understanding the molecular basis of plant resistance to fungal diseases will contribute to reducing world-wide crop losses. One model organism for studying disease resistance is Arabidopsis thaliana, a small member of the mustard family for which complete genomic sequence information was publicly released in 2000. Erysiphe cichoracearum, the causative agent for powdery mildew disease in a wide...