BACKGROUND The destructive plant disease potato late blight is caused by the oomycete pathogen Phytophthora infestans (Mont.) de Bary. This disease has remained particularly problematic despite intensive breeding efforts to integrate resistance into cultivated potato, largely because of the pathogen's ability to quickly evolve to overcome major resistance genes. The RB gene, identified in the w...

Endophytic Trichoderma is a fungus found in plant tissue and has the potential as biological control agent. The aim of this study was to endophytic isolated from tomato roots, stems leaves Phytophthora infestans fruit rot growth yield plants. treatments that were tested tricoderma plants applied with doses 50, 75, 100 g per plant, respectively. experimental design used completely randomized thr...

ABSTRACT Genetic structure of Phytophthora infestans, the causal agent of potato and tomato late blight, was analyzed spatially in a mixed potato and tomato production area in the Del Fuerte Valley, Sinaloa, Mexico. Isolates of P. infestans were characterized by mating type, allozyme analysis at the glucose-6-phosphate isomerase and peptidase loci, restriction fragment length polymorphism with ...

ABSTRACT Mycelium of Phytophthora infestans, the causal agent of potato late blight, can initiate crop infections over successive years by overwintering in infected potato tubers that survive as seed in fields or within cull piles. This study used four different genotypes of P. infestans to evaluate the influence of freezing temperatures on survival of mycelium in vitro. Sporangium-free myceliu...

While the mechanisms underlying quantitative resistance of plants to pathogens are still not fully elucidated, the Pathogen-Associated Molecular Patterns (PAMPs)-triggered response model suggests that such resistance depends on a dynamic interplay between the plant and the pathogen. In this model, the pathogens themselves or elicitors they produce would induce general defense pathways, which in...

The oomycete Phytophthora infestans is responsible for the disease known as late blight in potato and tomato. It plant pathogen that has caused greatest impact on humankind so far and, despite all studies have been made, it remains most important this crop. In Spain during last years a greater severity of observed both, tomato, probably due to genetic changes populations described recently. aim...

Damage caused by Phytophthora cinnamomi Rands remains an important concern on forest tree species. The pathogen causes root and collar rot, stem cankers, and dieback of various economically important Eucalyptus spp. In South Africa, susceptible cold tolerant Eucalyptus plantations have been affected by various Phytophthora spp. with P. cinnamomi considered one of the most virulent. The molecula...

A model for the size class distribution of plant disease on plant tissues is developed, inspired by late blight lesions on potato and tomato caused by Phytophthora infestans. In the absence of spatial dispersal the model becomes an infinite-dimensional Leslie matrix, and when spatial dispersal is considered several elements of the Leslie matrix are convolution operators accounting for the sprea...

The genetic basis of the resistance potatoes to Phytophthora infestans is well-studied. Plant P. genetically controlled, and secondary metabolites play a role, but themselves (e.g., phenylpropanoids) are poorly understood. This study aimed characterize effects two isolates host on metabolite expression in potato plants. To do this, phenylpropanoid pathway, chlorogenic acid, flavonoids, salicyli...

Grünwald, N. J., Martin, F. N., Larsen, M. M., Sullivan, C. M., Press, C. M., Coffey, M. D., Hansen, E. M., and Parke, J. L. 2011. PhytophthoraID.org: A sequence-based Phytophthora identification tool. Plant Dis. 95:337-342. Contemporary species identification relies strongly on sequence-based identification, yet resources for identification of many fungal and oomycete pathogens are rare. We de...