12/11/2023 0 Comments Ascochyta leaf blight campanula81 in: Descriptions of Pathogenic Fungi and Bacteria. Systematic Botany and Mycology Laboratory. To our knowledge, this is the first report of P. The pathogen is present worldwide on bean. The fungus was reisolated from lesions that developed on the leaves and stems of all inoculated plants. Inoculated plants showed characteristic symptoms of Ascochyta leaf spot 12 to 15 days after inoculation. Both inoculated and control seedlings (inoculated with sterile water) were covered with plastic bags for 72 h in a greenhouse at 23☌. These include: crop rotation, fungicide application, variety selection, irrigation management, tillage to reduce residue, and good grassy weed control. Symptoms and Signs Ascochyta blight can infect all above-ground plant parts (Figure 1), and can be found anytime after crop emergence. Ascochyta blight of pea (Ascochyta pisi) and lentil (Ascochyta lentis) are caused by different species, and do not cause Ascochyta blight on chickpea. To satisfy Koch's postulates, a conidial suspension (1 × 10 6 conidia per ml) of the fungus was sprayed onto leaves and stems of bean seedlings (first-leaf stage) (cv. Effective controls for a similar disease, Septoria leaf blotch, have been prescribed for Ascochyta leaf spot diseases. rabiei) causes Ascochyta blight of chickpea. Conidia were cylindrical to oval, allantoid, hyaline, pale yellow to brown, usually one-celled, and 2 to 3 × 5 to 10 μm. Spores were massed in pycnidia from which they were forced in long, pink tendrils under moist weather conditions. exigua Sutton and Waterstone on the basis of morphological characteristics of conidia and pycnidia (1,2). Apply an ascochyta fungicide before the first post-emergent rain event. Treat all planting seed with a registered fungicide, applied properly to ensure good coverage. Management Grow variety with the highest level of ascochyta resistance suitable for your area. The fungus was consistently isolated on potato dextrose agar from diseased leaves and pods and identified as Phoma exigua var. Seed has a known lowmoderate level of ascochyta infection. Plants sometimes showed defoliation and pod drop. Concentric dark gray-to-black lesions also appeared on branches, stems, nodes, and pods. Infected leaves had brown-to-black lesions that developed concentric zones 10 to 30 mm in diameter and also contained small, black pycnidia. It rarely was destructive unless the crop had been weakened by some unfavorable environmental conditions. During 20, a disease with typical blight symptoms was observed occasionally on dark red kidney, brown kidney, and black bean plants in most bean-producing areas of Greece. ![]() Common bean (Phaseolus vulgaris L.) is cultivated extensively in Greece for dry and fresh bean production.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |