Preliminary Exploration on Overwintering Conditions of Cercospora Sojina
In the northeast soybean production area,the soybean gray spot fungus has seriously increased due to the northward shift in soybean planting zone in recent years.Unfortunately,there is little research on the overwintering conditions and ability of Cercospora sojina currently,which is detrimental to the development of soybean crop rotation.To tackle this issue,we conducted a study where we placed soybean disease leaves in the northeast spring soybean production area at three different latitudes.We used three burial depth and four burial time treatments to determine the number of spore germination and the number of infested spots after one year.Our findings showed that the spore-producing ability of leaves buried at 0 cm was the strongest,followed by those buried at 10 cm.The spore-producing ability of those buried at 20 cm was the weakest.The spore-producing ability of the leaf residues gradually weakened with time.The longer the burial time and the deeper the burial depth,the lower the spore production ability and the number of spots infested with soybean leaves in the next year.Our study found that burial time,location,and depth all significantly affected disease incidence in the second year.We recommend that the relatively southern northeastern spring soybean production areas require 20 cm deep turning and 24 months of crop rotation for best results,while the northern part requires only 10 cm deep turning and 12 months of crop rotation.Therefore,our research provides a vital reference for selecting soybean varieties resistant to gray spot disease and comprehensive control of gray spot disease in the northern part of Heilongjiang Province.
万方数据
维普
