Environmental Entomology (1983) 12, 266-269

Gregory D. Johnson and Mir S. Mulla (1983)
Morphological and physiological parameters of soybean resistance to agromyzid beanflies
Environmental Entomology 12 (1), 266-269
Abstract: A quantitative and qualitative comparison of chironomid midge production was made between a portion of a residential-recreational lake kept free of aquatic macrophytes and a portion containing dense stands of aquatic weeds. Throughout this investigation, midge larval density and adult emergence were greater in the weed-free portions of the lake, with Tanytarsus spp. most prevalent from April through June. Midge populations in the weedless portions began declining in July and continued to do so through October, possibly due to predation by Procladius, the predominant midge during this time. Midge production in the weed-infested parts of the lake was lower and it showed more diversity than the vegetation-free portions. The low production of midges may have been due to the macrophytes acting as a physical barrier or elaborating biologically active chemicals, thus interfering with midge survival and development of some species and not of others.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Myriophyllum spicatum (weed)		U.S.A. (SW)
	Tanytarsus (genus - nuisance midges)		U.S.A. (SW)
	Procladius (genus)		U.S.A. (SW)