Insecticidal control of late-season plant bug (Hemiptera: Miridae) infestations in Manitoba has no effect on alfalfa seed quantity and quality

Mostafa, Ayman M.; Holliday, N. J.

doi:10.4141/cjps07181

Cited by 2 publications

(4 citation statements)

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“…The densities of Lygus spp. observed in lesquerella are on par with those in forage alfalfa, seed alfalfa, and canola (Butts and Lamb 1991;Mostafa and Holliday 2008;S.E.N., personal observation). The lack of any differences in damage or yield relative to time of infestation suggests that all three Lygus species function similarly and can be treated as a guild for pest management purposes.…”

Section: Discussionmentioning

confidence: 62%

“…effects on seed alfalfa yields may result from adult dominated agestructure at this time of the season. Mostafa (2007, cited in Mostafa and Holliday 2008) further showed a higher level of injury from Lygus spp. nymphs compared with adults on buckwheat.…”

Section: Discussionmentioning

confidence: 93%

“…nymphs and adults on crop damage and yield has been noted in various crops. Mostafa and Holliday (2008) suggested that the lack of late season Lygus spp. effects on seed alfalfa yields may result from adult dominated agestructure at this time of the season.…”

Section: Discussionmentioning

confidence: 98%

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Impact of <I>Lygus</I> spp. (Hemiptera: Miridae) on Damage, Yield and Quality of Lesquerella (Physaria fendleri), a Potential New Oil-Seed Crop

Naranjo¹,

Ellsworth²,

Dierig³

2011

jnl. econ. entom.

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Lesquerella, Physaria fendleri (A. Gray) S. Watson, is a mustard native to the western United States and is currently being developed as a commercial source of valuable hydroxy fatty acids that can be used in a number of industrial applications, including biolubricants, biofuel additives, motor oils, resins, waxes, nylons, plastics, corrosion inhibitors, cosmetics, and coatings. The plant is cultivated as a winter-spring annual and in the desert southwest it harbors large populations of arthropods, several of which could be significant pests once production expands. Lygus spp. (Hemiptera: Miridae) are common in lesquerella and are known pests of a number of agronomic and horticultural crops where they feed primarily on reproductive tissues. A 4-yr replicated plot study was undertaken to evaluate the probable impact of Lygus spp. on production of this potential new crop. Plant damage and subsequent seed yield and quality were examined relative to variable and representative densities of Lygus spp. (0.3-4.9 insects per sweep net) resulting from variable frequency and timing of insecticide applications. Increasing damage to various fruiting structures (flowers [0.9-13.9%], buds [1.2-7.1%], and seed pods [19.4-42.5%]) was significantly associated with increasing pest abundance, particularly the abundance of nymphs, in all years. This damage, however, did not consistently translate into reductions in seed yield (481-1,336 kg/ha), individual seed weight (0.5-0.7 g per 1,000 seed), or seed oil content (21.8-30.4%), and pest abundance generally explained relatively little of the variation in crop yield and quality. Negative effects on yield were not sensitive to the timing of pest damage (early versus late season) but were more pronounced during years when potential yields were lower due to weed competition and other agronomic factors. Results suggest that if the crop is established and managed in a more optimal fashion, Lygus spp. may not significantly limit yield. Nonetheless, additional work will be needed once more uniform cultivars become available and yield effects can be more precisely measured. Densities of Lygus spp. in unsprayed lesquerella are on par with those in other known agroecosystem level sources of this pest (e.g., forage and seed alfalfa, Medicago sativa L.). Thus, lesquerella production may introduce new challenges to pest management in crops such as cotton.

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Section: Discussionmentioning

confidence: 62%

Section: Discussionmentioning

confidence: 93%

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Impact of <I>Lygus</I> spp. (Hemiptera: Miridae) on Damage, Yield and Quality of Lesquerella (Physaria fendleri), a Potential New Oil-Seed Crop

Naranjo¹,

Ellsworth²,

Dierig³

2011

jnl. econ. entom.

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“…Plant bugs (Heteroptera: Miridae) of the genera Lygus Hahn and Adelphocoris Reuter are important crop pests in the Canadian Prairie Provinces (Kelton 1980), where they attack a wide range of crops including canola (Butts and Lamb 1990; Gerber and Wise 1995), alfalfa (Craig 1983; Soroka and Murrell 1993; Gerber and Wise 1995; Mostafa and Holliday 2008), and buckwheat (Wise et al 2005). The most common Lygus species present in Manitoba crops are Lygus lineolaris (Palisot de Beauvois), Lygus borealis (Knight), and Lygus elisus (Van Duzee) (Timlick et al 1993; Gerber and Wise 1995; Mostafa 2007).…”

Section: Introductionmentioning

confidence: 99%

Plant bugs (Hemiptera: Miridae) on field beans and soybeans in Manitoba, Canada: species composition and seasonal occurrence

Nagalingam

Holliday

2015

Can Entomol

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In Manitoba, Canada, commercial soybeans and two types of field beans, navy and pinto, were sampled for plant bugs. At the centre and margins of 36 fields, sweep net and tap tray samples were taken weekly. In all three crops, Lygus lineolaris (Palisot de Beauvois) (Hemiptera: Miridae) comprised > 78% and Adelphocoris lineolatus (Goeze) (Hemiptera: Miridae) < 10% of adult mirids. Species composition varied among years but not among crops. For Lygus Hahn, nymphs were 46% of the catch in trays and 23% in sweeps, but total Lygus catch in trays was > 2% of that in sweeps. Catch/ sample effort was similar at field centres and margins for both Lygus adults and nymphs. Lygus lineolaris reproduced and developed in all three crops. In field beans, Lygus adults were first collected in late vegetative and early pod set stages and late instar nymphs and adults were present from pod elongation until maturityresults consistent with immigration of first summer generation reproductive adults and development of the second generation in the crops. There was evidence of late season immigration of Lygus into all crops. There was no loss of seed quantity attributable to mirids in any of the crops; in field beans there was no evidence that mirids reduced seed quality.

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Insecticidal control of late-season plant bug (Hemiptera: Miridae) infestations in Manitoba has no effect on alfalfa seed quantity and quality

Cited by 2 publications

References 16 publications

Impact of <I>Lygus</I> spp. (Hemiptera: Miridae) on Damage, Yield and Quality of Lesquerella (Physaria fendleri), a Potential New Oil-Seed Crop

Impact of <I>Lygus</I> spp. (Hemiptera: Miridae) on Damage, Yield and Quality of Lesquerella (Physaria fendleri), a Potential New Oil-Seed Crop

Plant bugs (Hemiptera: Miridae) on field beans and soybeans in Manitoba, Canada: species composition and seasonal occurrence

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