Texas, USA 2010 - International Herbage Seed Group

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Number of seeds/inflorescenceMaterials and Methods:Field experiments were carried out from 2004 to 2009 in three locations in France: near Angers(northwest of France), Chateauroux and mainly near Bourges (central France). The threshold toapply insecticide before flowering time is one hundred clover seed weevils caught in 25semicircles of butterfly net. At ripeness, 4 × 50 inflorescences are collected before harvest toestablish the number of good seed /inflorescence, which is one of the best ways to appreciate thepesticide‟s efficiency.Also, the clover crops are harvested directly with an experimental combiner. <strong>Seed</strong> samples arecleaned and seed yield is calculated for each sample.Results and discussion:- Alternative method:Some trials have been carried out for organic farming. Roténone, natural pyrethrinoid,azadirachtine, plant manure have been tested unsuccessfully to control apion trifolii attacks.(Bouet 2003). Another method has been tested without chemical: One possibility to avoid attacksof clover seed weevil could be to delay the spring mowing; so eggs and larvae could bedestroyed and the next flowering would be less sensitive to the weevil damage.Four dates of cutting from May (normal date) to July are compared to one modality withoutcutting. Our experimental results indicate the egg-laying period is so large that it requires a verylate cutting which leads to an inappropriate date of seed harvest.Figure 1: Effect of the date of cutting on the number of seeds /inflorescence in organic red cloverseed production – (FNAMS/ARVALIS Chateauroux, 2004)80Harvest :11-oct6040Harvest :16-sept200No cutting 13 may 02 june 25 june 20 julyDate of cutting- Acetamipride trials:Acetamipride (50 g. a. i. /ha) has been studied for five years and has shown very good results tocontrol apion trifolli damage. Acetamipride‟s efficiency on apion trifolli adult is always promptand more persistent than the reference (bifenthrine). The number of seed per inflorescence is161
Number of seeds /inflorescencesimilar to the reference but with less application (ex: 2008) which is showing a high efficacylevel. At a lower rate (40g a. i./ha.), acetamipride‟s efficiency seems to decrease regarding tothe results on number of seed/inflorescence (Bourges 2008).Figure 2: Insecticide effects on the number of seeds /inflorescence in red clover seed production(FNAMS Bourges, 2008) (Date of spraying : D1= 25/06/08 D2= 01/07/08)100908092a84b75c89ab85b70605050d4030<strong>2010</strong>0Checkbifenthrine(16 g/ha)-D1puis (16 g/ha)-D2acetamipride(50 g/ha)-D1acetamipride(40 g/ha)-D1spinosad(96 g/ha)-D1spinosad(96 g/ha)-D2 (lateapplication )- Thiaclopride trials:Only one year trials (2009) has been carried out recently with thiaclopride (62.5g a.i./ha +deltaméthrine 6.25g . a. i./ha). This association has shown the same results as acetamipride in asingle application with a prompt and persistent efficiency on adult. Number of seed/inflorescence and seed yield obtained are better than with one application of bifenthrine.Figure 3: Insecticide effects on apion triflolii population in red Clover seed production (FNAMSBourges, 2009)D1: Date of spraying: 12/06/09162
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Proceedings of the 7th Internationa
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Table of ContentsORAL PRESENTATIONS
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Seed yield components and yield per
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International Herbage Seed Conferen
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16:15 - 16:30 Reliability of salini
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Hotel expense is covered for night
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40,000 were slaves (McDonald, 2007)
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Fig. 1. Texas AgriLife Research and
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$7 billion for cattle, $3 billion f
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principle and encourages both AgriL
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eceived by growers, the above perce
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seed conditioning plants are locate
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Table 4.Hectares of open-field burn
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system, a seed crop is produced fro
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Fig. 1. Land resource areas of Texa
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y land owners. Seed yields are low
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The influence of planting density o
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Simple correlation and regression a
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Variation in seed shattering in a g
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Seed retention (SR) was calculated
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mm160120Precipitation8040020Km h -1
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Young, B. A. (1986). A Source of Re
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Several methods are commonly used f
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Table 3. Effect of the length of ha
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Alfalfa seed production in semi-hum
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Rather near the meteorological stat
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ReferencesBolaños-Aguilar E.D., Hu
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ased bioenergy conversion plants wa
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Table 1. Average distances required
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Figure 1. Optimized locations for 1
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Perennial ryegrass (Lolium perenne
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Relative Seed Yieldsingle composite
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Flowers, M.D.; Hart, J.M.; Young II
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Thus, similar to tissue tests, remo
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Conclusion:Perhaps our most importa
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Modelling critical NDVI curves in p
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The five spectral reflectance measu
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Harvest loss in ryegrass seed crops
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Larger than expected harvest losses
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Rolston, P.; Trethewey, J.; McCloy,
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Optical sensors have the potential
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Figure 2. Seed yield response to ap
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Flowers, M. D., Hart, J.M., Young I
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In 2010, France has launched the fo
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Yield (% maximum)ConclusionThe resu
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Plant N uptakeN unavailableSoil nit
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Stresses associated with germinatio
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correspond to electrical conductivi
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applied later in the fall was more
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Figure 2. Establishment of five ove
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The seed vigour testing was perform
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Table 1. Germination index (GI) for
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Reliability of salinity screening L
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AcknowledgmentThis research was sup
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Table 2. Greenhouse salinity screen
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The seeds were collected from the A
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increases germination to its potent
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Light, lodging and flag leaves-what
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Relative seed yieldSeed yield (kg/h
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Hampton, J.G.; Clemence, T.G.A.; He
Page 121 and 122: The seed set is of major importance
Page 123 and 124: In grass species with poor seed ret
Page 125 and 126: support system to optimize fungicid
Page 127 and 128: weather stations in grass seed fiel
Page 129 and 130: ust resistance loci in Lolium peren
Page 131 and 132: Seed yield variation in a red clove
Page 133 and 134: 100Seed yield plant -1 (g)806040200
Page 135 and 136: Marden, J. H. 1984. Remote percepti
Page 137 and 138: Crimson clover seed production in t
Page 139 and 140: Piper, C.V. 1935. Forage plants and
Page 141 and 142: deal of investigation into the caus
Page 143 and 144: genes and subsequent ability to pro
Page 145 and 146: Gatenby, W.A., S.C. Munday-Finch, A
Page 147 and 148: Control of Vulpia myuros in red fes
Page 149 and 150: The strip design provides an opport
Page 151 and 152: The pot experiments did not reveale
Page 153 and 154: CharacterWeed abundance1 A few plan
Page 155 and 156: Jensen, P. K. (2010) Longevity of s
Page 157 and 158: Effects of intraspecific competitio
Page 159 and 160: flowering, Gangi accumulated a high
Page 161 and 162: The seed yield of Gangi was, on ave
Page 163 and 164: Seed yield components and yield per
Page 165 and 166: ResultsVariation among populations
Page 167 and 168: Table 2. Means of total seeds per p
Page 169 and 170: Ryle, G. J. (1970). Partition of As
Page 171: Control of Apion trifolii in red cl
Page 175 and 176: population. However, in spite of th
Page 177 and 178: Corvallis where they were debearded
Page 179 and 180: Table 1. Effect of Palisade growth
Page 181 and 182: Variations on potential and harvest
Page 183 and 184: Determination of optimum desiccatio
Page 185 and 186: Relative seed yield (%)Flowers/m225
Page 187 and 188: Harvesting too soon after peak flow
Page 189 and 190: Annual ryegrass seed production in
Page 191 and 192: seed yield, kg/haExtractable Al, mg
Page 193 and 194: ReferencesHaby, V.A. (1995). Soil m
Page 195 and 196: Kentucky bluegrass (Poa pratensis L
Page 197 and 198: urn residue management (Fig. 1 and
Page 199 and 200: Comparing herbicide selectivity in
Page 201 and 202: Development of new tetraploid Chlor
Page 203 and 204: Following 4 (or 5) cycles of select
Page 205 and 206: Loch, D.S., Rethman, N.F.G. & van N
Page 207 and 208: KBGcocksfootHykorLofatimothymeadowf
Page 209 and 210: Figure 2 Relative seed yield (%) se
Page 211 and 212: and GA 4 . In consequence this inac
Page 213 and 214: Table 1 The effect of trinexapac-et
Page 215 and 216: Silberstein, T.B., Young, W.C. III,
Page 217 and 218: inflorescece number and seed yield
Page 219 and 220: Germination of Lolium multiflorum g
Page 221 and 222: Effect of sowing density on seed yi
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y-products of this grass seed crop
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Table 2. Effect of PGR on seed yiel
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Further culm length measurements ga
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chlorophyllometer. Measurements wer
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Table 2. Photosynthesis rate of fla
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Organization of grass seed research
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Path Coefficient and Ridge Regressi
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through y4 (0.133). Increasing y 1
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Newell G.J., Lee B. (1981)Ridge reg
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Relative humidity, seed moisture co
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Ergovaline contents in grasses from
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11.8 % (Central East) to 40.0% (Nor
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ReferencesBony, S. & Delatour, P. (
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Long-term Evaluation of Annual Ryeg
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seed yield. All systems of establis
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Preliminary results after four year
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Casals, Marie-LaureFNAMSImpasse du
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Mao, PeishengForage Seed LabChina A
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Vanasche, DavidVanasche Farm36130 N
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Texas, USA 2010 - International Herbage Seed Group

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