Abstract:
【Objective】The major insect pests in the Huangshan large leaf tea gardens are
Empoasca vitis,
Toxoptera aurantii,
Aulcophora femoralis and
Ricaniaspeculum. To investigate the population dynamics between the four major pests and their natural predators. 【Method】 The quantity, and the temporal and spatial relationships of the four pests and their predators were analysed using grey correlation degree and ecological niche analyses. The dominant natural predator of each pest was evaluated using the sum of close index.【Result and conclusion】 There were greater differences for dominant natural predators of four pests between spring-summer season and autumn-winter season. In spring-summer season the three dominant natural predators of
Empoasca vitis were
Oxyopes sertatus,
Neoscona theisi and
Tetragnatha maxillosa; the dominant natural predators of
Toxoptera aurantii were
Leis axyridis,
Propylea japonica and
Tetragnatha maxillosa; for
Galerucinae, the main natural predators were
Propylea japonica,
Leis axyridis and
Erigonidium graminicolum; and for
Ricaniaspeculum, the predators were
Clubiona japonicola,
Tetragnatha maxillosa and
Xysticus ephippiafus. In autumn-winter season, the three dominant natural predators of
Empoasca vitis were
Tetragnatha maxillosa,
Theridion octomaculatum and
Tetragnatha squamata; the three dominant natural predators of
Toxoptera aurantii were
Tetragnatha maxillosa,
Theridion octomaculatum and
Tetragnatha squamata; for
Galerucinae, the main natural predators were
Propylea japonica,
Leis axyridis and
Tetragnatha maxillosa; and for
Ricaniaspeculum, the predators were
Neoscona theisi,
Oxyopes sertatus and
Xysticus ephippiafus.
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