Hairy vetch is a leguminous winter annual cover crop that provides a significant contribution toward meeting the nitrogen requirement of succeeding crops. Hairy vetch residue is capable of suppressing weeds, but low levels of residue can intermittently stimulate the emergence of weeds, particularly smooth pigweed. This research was conducted to assess the inhibitory and stimulatory effects of h...

چکیده به منظور بررسی کارایی چهار علف کش اتال فلورالین، تریفلورالین، پندیمتالین و متری بوزین در مزارع سیب زمینی و روی علف های هرز سلمه و تاج خروس آزمایشی گلخانه ای در سال 1387 در دانشگاه محقق اردبیلی انجام شد. آزمایش ها به صورت پاسخ به دز در قالب طرح کاملاً تصادفی با 4 تکرار و با استفاده از رقم آگریا انجام شد. کلیه علف کش ها در 6 دز به صورت دزهای کاهش یافته تا دزهای افزایشی نسبت به دز توصیه شده ا...

Abstract Weed control efficacy and ornamental plants tolerance to dimethenamid–p (0.75%) + pendimethalin (1%) granular herbicide was evaluated in flat tray-grown weeds container-grown plants. Dimethenamid – p at 2.94 kg ai.ha–1 (2.62 lb ai.A–1) controlled the tested broadleaf grassy >80% for up 8 wk following application. The higher rates of ≥5.88 (≥5.25 provided 94% 99% weed species but...

Introduction:The prevalence of atopic diseases has increased in recent decades dramatically. The most common aeroallergens in Northeastern Iran have not been fully defined. Define the most common aeroallergens in allergic patients based on the skin prick test (SPT) was aimed in this investigation.Materials and Methods:This cross-sectional study enrolled 1,006 allergic patients (aged 1–86 years)...

Beet armyworm, Spodoptera exigua (Hübner), oviposition preferences were determined on Þve host plants: cabbage (Brassica oleracea capitata L.), cotton (Gossypium hirsutum L.), bell pepper (Capsicum annuum L.), pigweed (Amaranthus retroflexus L.), and sunßower (Helianthus annuus L.) in no-choice, two-choice, and Þve-choice tests. Tests were conducted in the laboratory, greenhouse, and Þeld cages...

Soltani, N., Vyn, R. J., Van Eerd, L. L., Shropshire, C. and Sikkema, P. H. 2009. Effect of reduced herbicide rates on weed control, environmental impact and profitability of corn. Can. J. Plant Sci. 89: 969 975. A study was conducted over a 3-yr period (2003, 2004, and 2005) to evaluate the effect of reduced herbicide rates 20, 40, 60, 80, and 100% of the manufacturer’s recommended rate (MRR) ...

employment of solarization using the polyethylene mulch can be effective as a non-chemical approach for some control noxious weed management such as purple nutsedge (cyperus rotundus). in order to determine the effect of different levels of polyethylene mulches including one- layer clear polyethylene film, two- layer clear polyethylene film, one- layer black polyethylene film and two- layer bla...

The influence of weed seed predation by invertebrates and vertebrates was examined in relation to distance from hedgerows in maize fields of southwestern Michigan. Experiments were conducted in spring and winter and included five common weed species, i.e., velvet-leaf (Abutilon theophrasti), redroot pigweed (Amaranthus retroflexus), common lamb's-quarters (Chenopodium album), fall panicum (Pani...

We reviewed the timing of peak rate emergence for 15 problematic weed species as well ways to use this knowledge improve control. Much previous literature modeled based on growing-degree-days. For these models, we input average temperature data from several zones Northeast USA. Within species, model-predicted in warmest and coolest differed by an 39 days. Also within there was some variation be...