Abstract Potato is the third most important staple food crop globally following rice and wheat. In United States, potato grown on approximately 410,000 ha with a farm-gate value of US$1,032 million. Canada, 134,000 US$235 The objective this manuscript, compiled by Weed Science Society America Loss Committee, was to estimate yield loss caused weed interference. data from weedy weed-free plots (or >95% control) obtained researchers working management in States Canada or published...

Abstract P otato virus Y ( PVY ) strains are transmitted by different aphid species in a non‐persistent, non‐circulative manner. Green peach GPA ), M yzus persicae S ulzer, is the most efficient vector laboratory studies, but potato PA acrosiphum euphorbiae T homas (both H emiptera: A phididae, acrosiphini), and bird cherry‐oat BCOA R hopalosiphum padi L . phidini), also contribute to transmission. Studies were conducted with , assess transmission efficiency for various isolates of same...

Potato virus Y (PVY) is a major concern for potato production in the United States given its impact on both crop quality and yield. Although green peach aphid, Myzus persicae (Sulzer), most efficient PVY vector, it may be less abundant potato-growing areas of Idaho relative to non-potato-colonizing aphid vectors that disperse from nearby cereal fields other crops. A field study was conducted during 2012–2013 examine if noncolonizing aphids as crops dry down before harvest. The fauna sampled...

There has been a recent shift in the prevalence of Potato virus Y (PVY) strains affecting potato with ordinary strain PVYO declining and recombinant PVYNTN PVYN:O emerging United States. Multiple PVY are commonly found fields even individual plants. Factors contributing to emergence not well defined but differential aphid transmission from single mixed infections may play role. We that efficiencies by Myzus persicae, green peach aphid, PVYNTN, PVYN:O, varied depending on cultivar serving as...

Potato virus Y (PVY) is an economically important and reemerging potato pathogen in North America. PVY infection reduces yield, some necrotic recombinant strains render tubers unmarketable. Although PVY(O) the most prevalent strain United States, PVY(NTN) PVY(N:O) are becoming more widespread. Infection rates aphid-inoculated (Myzus persicae (Sulzer)) mechanically inoculated plants were compared across two genotypes ('Yukon Gold' A98345-1), three (PVY(O), PVY(N:O), PVY(NTN)), growth stages...

The effects of postemergence rimsulfuron, metribuzin, and adjuvant combinations on potato crop safety weed control were evaluated in field studies conducted at the University Idaho Aberdeen Research Extension Center 1999 2000. Rimsulfuron 26 g ai/ha plus metribuzin 0, 140, or 280 was combined with nonionic surfactant (NIS), oil concentrate (COC), methylated seed (MSO) a 3 by factorial two controls. Under cool, cloudy conditions 1999, initial ‘Russet Burbank’ injury greater when included tank...

Field trials were conducted to determine potato response parts per trillion (ppt) weight concentrations of sulfometuron in soil. The herbicide was applied achieve targeted, 0-d soil 0, 7.5, 15, 30, 60, 120, 240, 480, and 960 ppt. Russet Burbank potatoes planted immediately after application using standard agronomic practices. Based on midseason visual evaluations, root tuber injury occurred with only 7.5 Concentrations at or above 120 ppt caused a significant increase number tubers...

Barley yellow dwarf virus (BYDV) is an important vector-borne pathogen of cereals. Although many species grasses are known to host BYDV, knowledge their role in spread regional agroecosystems remains limited. Between 2012 and 2016, Idaho winter wheat production was affected by BYDV. BYDV-PAV the bird cherry-oat aphid (BCOA) (Rhopalosiphum padi L.) vector were commonly present areas. A series greenhouse bioassays performed examine whether two types corn (Zea mays L.), dent sweet, three found...

Potato leaf roll virus (PLRV) can reduce tuber yield and quality in potato. Green peach aphid (Myzus persicae [Sulzer]) potato (Macrosiphum euphorbiae [Thomas]) are the two most important potato-colonizing PLRV vectors Pacific Northwest. We compared My. Ma. densities incidences among varieties field to clarify relationships between abundance incidence plants. Aphids were sampled weekly over three years Russet Burbank, Ranger Russet, Norkotah a replicated trial. In all years, was more...

Greenhouse and field trials were conducted at the Aberdeen Research Extension Center to determine effect of hairy nightshade competition on two potato varieties with different growth habits. replacement included treatments three plants total in each pot : ratios 3 0, 2 1, 1 2, or 0 3. Varieties tested ‘Russet Burbank’ Norkotah’. Greenhouse-grown (cotyledon one-leaf stage) transplanted into pots earlier than same time as plant emergence. As number Russet Burbank per decreased, biomass dry...

Field studies were conducted at Aberdeen, ID; Ontario, OR; and Paterson, WA, to evaluate potato tolerance flumioxazin sulfentrazone. In ‘Russet Burbank’ trials in 2000 ID, OR, sulfentrazone applied preemergence (PRE) rates ranging from 105 280 g ai/ha caused significant injury consisting of stunting, leaf discoloration-blackening, and/or malformation-crinkling 4 wk after treatment (WAT). By 12 WAT, was ≤5%. At PRE 140 resulted injury, whereas 53 did not cause injury. no visual present the ID...

In 2004 and 2005, field research was conducted in Idaho to compare tank mixtures of flumioxazin at the 53 g ai/ha potato use rate with comparable rimsulfuron 26 for broad-spectrum weed control. Flumioxazin two-way metribuzin, EPTC, pendimethalin, S -metolachlor, or ethalfluralin provided greater than 90% hairy nightshade control, which control by similar mixtures. plus metribuzin were only consistently providing redroot pigweed, common lambsquarters, green foxtail Control these weeds any...

Field research trials were conducted in Idaho at the Aberdeen Research and Extension Center 2006 2007 to determine critical interference period of hairy nightshade potatoes. ‘Russet Norkotah’ variety was planted both years plots three rows wide by 12 m long. When potatoes had emerged, one- two-leaf plants that been germinated grown greenhouse transplanted a 2 −1 row density allowed grow for 10, 20, 30, or 40 d after emergence (DAE) before removal, maintained weed-free 0, DAE transplanting....

Treatments of dimethenamid-p at 0.7 kg ai/ha applied PRE in tank mixtures with EPTC (3.4 ai/ha), metribuzin (560 g pendimethalin (1.1 or rimsulfuron (26 ai/ha) were compared the same herbicides alone field efficacy trials Idaho, Oregon, and Washington. Common lambsquarters, kochia, redroot pigweed control was generally improved by any herbicide except metribuzin. Hairy nightshade two locations alone. At Washington, where row spacing narrower than other locations, provided similar hairy...

Dimethenamid-p was labeled for preemergence use in potatoes 2005. The herbicide provides hairy nightshade control; however, a tank-mix partner targeting common lambsquarters must be used order to provide satisfactory control of that weed. S-metolachlor and metolachlor, also potato, are the same chemical family as dimethenamid-p questions have arisen whether or not these herbicides different levels control. objectives this study, therefore, were (1) compare other weeds potato with applied at...

Field studies were conducted to evaluate weed control, tuber yield, gross return, economic return on investment (EROI), and net in glyphosate-resistant ‘Ranger Russet’ potato 2000 2001 at the University of Idaho Aberdeen Research Extension Center near Aberdeen, ID. Three types control programs evaluated: a total glyphosate program single or sequential applications (TGLY), tank mixtures residual herbicides applied early postemergence (GLY RES EPOST), preemergence followed by (fb) late...

Field trials were conducted with sulfentrazone at 53, 80, and 105 g ai/ha combined 0, 420, 560 metribuzin in a 3 by factorial arrangement. Sulfentrazone combinations improved control of redroot pigweed, common lambsquarters, hairy nightshade, volunteer oat compared applied alone. Kochia was more than 90% regardless presence the treatment. g/ha needed for greater nightshade control. alone or combination did not provide 89% Potato crop injury less 5% total tuber yields increased as rate from 0...

The creation of attractive, sustainable wildflower meadows in private and public green spaces is becoming increasingly popular. Establishment failure rate for new meadow plantings can be very high, primarily because the initial annual weed pressure. We proposed a 3-step grass-first establishment protocol based on plant augmentative succession principles: 1) spring planting grass component species; 2) application standard turf-appropriate weed-control methods; 3) early fall overseeding or...

Double-stranded RNA preparations from Chenopodium quinoa leaves inoculated with two English isolates of beet soil-borne virus (BSBV), BSBV-N and BSBV-452N, a French isolate necrotic yellow vein (BNYVV), Swedish tubular (86–109) or Belgian similar (1530) were compared following separation on non-denaturing polyacrylamide gels. The dsRNAs BNYVV differed in mobility those isolated tissue infected the other four viruses, which possessed three major dsRNA species. degree sequence identity between...

Field studies were conducted from 2000 to 2003 determine the effectiveness of potato desiccants for late-season hairy nightshade control and also their effect on seed germination. Commercial sulfuric acid at 280 L/ha controlled 94 99% 1 wk after treatment (WAT) in all years. Diquat 560 g/ha glufosinate-ammonium 420 provided least 93% WAT years except when did not exceed 72%. By 3 WAT, ranged 93 100% treatments, including carfentrazone-ethyl 56 g/ha, diquat paraquat 530 (proprietary process)...

Sulfentrazone was applied POST at 13, 26, or 53 g ai/ha alone in combination with metribuzin 280 420 field trials conducted ‘Russet Burbank’ potatoes 2002 to 2004. provided less than 84% redroot pigweed, common lambsquarters, and kochia control, although control usually improved 90% greater when included. Hairy nightshade reached only the highest rates of both herbicides were combination. did not provide any volunteer oat whereas 85% rate Potato crop injury, consisting chlorosis, interveinal...