Effects of Different Planting Densities on Soybean Sclerotinia Stem Rot Disease Index

doi:10.11923/j.issn.2095-4050.cjas15020003

Abstract

Abstract: The study aims to determine the correlation between the disease index of Sclerotinia sclerotiorum and the main influencing factors of different soybean planting densities. The test set up 3 density treatments in 2014, 25×104 strains/hm2, 30×104 strains /hm2 and 35×104 strains /hm2. The average soil moisture, average soil temperature, stem strength, stem diameter, germination number of sclerotium apothecium and the Sclerotinia sclerotiorum disease index were investigated at the end of August. The path analysis was used to analyze the Sclerotinia sclerotiorum index and data processed. The results showed that, although the production increased under high density planting of soybean, the disease index also increased. The main reason was the weakening of stem strength and the increase of germination number of apothecium, which led to severe occurrence of Sclerotinia sclerotiorum. In the future, close attention should be paid to Sclerotinia sclerotiorum in case of large germination amount of apothecium in high density planting of soybean.

CLC Number:

S432.1

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