The effects of intercropping of wheat cultivars and oilseed rape on the densities of wheat aphid, Sitobion
avenae, and their arthropod natural enemies were evaluated. Three winter wheat cultivars with different
resistant levels to S. avenae were used: ‘KOK’ (high resistance), ‘Xiaobaidongmai’ (low resistance) and
‘Hongmanghong’ (susceptible). The results showed that the densities of S. avenae were significantly higher
on the monoculture pattern than on either the 8-2 intercropping pattern (eight rows of wheat with two
rows of oilseed rape) or the 8-4 intercropping pattern (eight rows of wheat with four rows of oilseed rape).
The mean number of predators and the mummy rates of S. avenae were significantly higher in two intercropping
patterns than those in the monoculture pattern. The densities of S. avenae, ladybeetles, and
mummy rate of S. avenae were significantly different among different wheat cultivars. The highest densities
of S. avenae and ladybeetles were found on wheat cultivar Hongmanghong. The lowest densities of
S. avenae associated with high mummy rate of S. avenae were found on wheat cultivar Xiaobaidongmai.
The results showed that wheat-oilseed rape intercropping conserved more predators and parasitoids than
in wheat monoculture fields, and partial resistance of wheat cultivar Xiaobaidongmai had complementary
or even synergistic effects on parasitoid of S. avenae.
The effects of intercropping of wheat cultivars and oilseed rape on the densities of wheat aphid, Sitobionavenae, and their arthropod natural enemies were evaluated. Three winter wheat cultivars with differentresistant levels to S. avenae were used: ‘KOK’ (high resistance), ‘Xiaobaidongmai’ (low resistance) and‘Hongmanghong’ (susceptible). The results showed that the densities of S. avenae were significantly higheron the monoculture pattern than on either the 8-2 intercropping pattern (eight rows of wheat with tworows of oilseed rape) or the 8-4 intercropping pattern (eight rows of wheat with four rows of oilseed rape).The mean number of predators and the mummy rates of S. avenae were significantly higher in two intercroppingpatterns than those in the monoculture pattern. The densities of S. avenae, ladybeetles, andmummy rate of S. avenae were significantly different among different wheat cultivars. The highest densitiesof S. avenae and ladybeetles were found on wheat cultivar Hongmanghong. The lowest densities ofS. avenae associated with high mummy rate of S. avenae were found on wheat cultivar Xiaobaidongmai.The results showed that wheat-oilseed rape intercropping conserved more predators and parasitoids thanin wheat monoculture fields, and partial resistance of wheat cultivar Xiaobaidongmai had complementaryor even synergistic effects on parasitoid of S. avenae.
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