Relationship between Oides decempunctata and its natural enemies under different fertilization treatments in grapery in Jianghuai hilly region and ancient course of the Yellow River

A systematic investigation of O. decempunctata and its natural enemies was conducted in grapery under four fertilization treatments (water, vinegar, neodymium and lanthanum spray) in order to protect and use natural enemies in integrated pest management and high-yield cultivation of graperies in Xiaoxian County and Feidong County, Anhui Province. Grey systematic and ecological niche analyses were used to establish the number and spatio-temporal distribution correlations between O. decempunctata and its natural enemies. The results of synthetic ranking are that, for Xiaoxian grapery, the main natural enemies of O. decempunctata are Propylaea japonica, Erigonidium graminicolum and Lycosa pseudoannulata under water spray treatment; L. pseudoannulata, P. japonica and Harmonia axyridis under vinegar spray treatment; E. graminicolum, H. axyridis and P. japonica under neodymium spray treatment; and P. japonica, H. axyridis and E. graminicolum under lanthanum spray treatment. For Feidong grapery, the main natural enemies of O. decempunctata are E. graminicolum, Theridion octomaculatum and L. pseudoannulata under water spary treatment; L. pseudoannulata, E. graminicolum and P. japonica under vinegar spray treatment; E. graminicolum, L. pseudoannulata and T. octomaculatum under neodymium treatment; and T. octomaculatum, E. graminicolum and L. pseudoannulata under lanthanum spray treatment. Natural enemies of O. decempunctata distinctly vary with treatment type and location. The most common natural enemies of O. decempunctata in two locations are E. graminicolum and L. pseudoannulata under water spray treatment, L. pseudoannulata and P. japonica under vinegar spray treatment, and E. graminicolum under neodymium and lanthanum spray treatments.