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• W2017408420 abstract "Abstract Adults of B . cephi emerged at the same time as the adults of their host, the wheat stem sawfly, and started to oviposit about mid-July. The second generation started to emerge between August 5 and 15. This generation, which was complete in some years, was apparently only partial in years in which adults of the first generation continued to oviposit late in the season. In most cases the larvae of Bracon that were present at harvest time were from eggs laid after August 1. Most of the overwintering B . cephi were located in the lower internodes of the sawfly-infested wheat stems. Although B . cephi attacked some sawfly larvae in their stubs most sawflies escaped parasitism once they had cut their host stems. High host densities per stem in hollow-stemmed wheats were detrimental to Bracon during the early part of the season as the unparasitized sawfly larvae in stems containing B . cephi destroyed the parasite larvae. The sawfly-susceptible wheats were more suitable than the resistant for parasitism. Generally, differences in parasitism between wheats and between barleys were caused by differences in length of survival of the sawfly larvae in the different host plants; longer survival led to higher parasitism. The fluctuations in amounts of parasitism mainly depended on the synchronization of development between B . cephi and the sawfly. Parasitism increased when the sawfly larvae cut their host stems sufficiently late to allow establishment by the second generation of B . cephi and decreased when the sawfly cut too early for parasitism by the second generation. The date of ripening of the host plant governs the date of cutting by the sawfly; hence, the amount of parasitism is influenced by the levels of soil moisture and temperature during the growing season, by differences in rate of development of various plant hosts, and by the date of seeding. Low levels of parasitism resulted from early ripening of the sawfly host plants in two consecutive years, whereas a moderately high level occurred even though the weather of the current year was conducive to early ripening, provided that the wheat in the preceding year had ripened late. It appears that moderate to high levels of parasitism required that the crop ripen late in at least one year out of two." @default.
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• W2017408420 date "1963-02-01" @default.
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• W2017408420 title "Causes of Variations in Effectiveness of <i>Bracon cephi</i> (Gahan) (Hymenoptera: Braconidae) as a Parasite of the Wheat Stem Sawfly" @default.
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• W2017408420 doi "https://doi.org/10.4039/ent95113-2" @default.
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