Effect of Varying Potato Leafhopper (Homoptera: Cicadellidae) Population Densities on Snap Bean Yield

1991 ◽  
Vol 84 (2) ◽  
pp. 644-649 ◽  
Author(s):  
A. L. Gonzalez ◽  
J. A. Wyman
Keyword(s):  
Potato Leafhopper ◽  
Population Densities ◽  
Snap Bean ◽  
Bean Yield

scholarly journals Field Plot Technique Affects Snap Bean Yield Evaluation

1993 ◽  
Vol 118 (5) ◽  
pp. 672-674 ◽  
Author(s):  
Gavin R. Sills ◽  
James Nienhuis
Keyword(s):  
Plant Population ◽  
Interactive Effects ◽  
Field Plot ◽  
Population Densities ◽  
Single Degree Of Freedom ◽  
Snap Bean ◽  
Plot Size ◽  
Bean Yield ◽  
Harvest Method ◽  
Field Plot Technique

The interactive effects of genotypes, plant population densities, and harvest methods on snap bean (Phaseolus vulgaris L.) yield evaluation were investigated using a split-split plot factorial arrangement of treatments at two locations Six snap bean processing cultivars were grown at 5.5, 11, and 22 plants/m2 and harvested either by machine or by hand. Each' of three commercial seed companies provided two cultivars, one of which was described as “good” and the other as “poor” for machine harvesting. Genotype × harvest method interactions were not significant for pod count, but were significant when yield was evaluated as pod weight. This latter interaction was explained by a single-degree-of-freedom contrast of genotypes × (“good” vs. “poor” harvestability). Genotype × density and genotype × density × location interactions were significant for both pod count and weight. The density × harvest method interaction was nonsignificant for both yield variables. These results suggest that breeders can evaluate yield of genotypes using either hand or machine harvest but should use plant population densities appropriate to commercial production. Optimum plot size for snap bean yield evaluations at these locations under the various conditions imposed were estimated.

scholarly journals Potato Leafhopper Control in Snap Bean With Insecticides Allowed for Organic Production, 2019

2020 ◽  
Vol 45 (1) ◽  
Author(s):  
Riley Suzanne Harding ◽  
Brian A Nault ◽  
Abby Seaman
Keyword(s):  
Organic Production ◽  
Potato Leafhopper ◽  
Snap Bean

scholarly journals Potato Leafhopper Control in Snap Bean With Insecticides Allowed for Organic Production, 2017

2020 ◽  
Vol 45 (1) ◽  
Author(s):  
Riley Suzanne Harding ◽  
Brian A Nault ◽  
Abby Seaman
Keyword(s):  
Organic Production ◽  
Potato Leafhopper ◽  
Snap Bean

scholarly journals Contribution of components of production on snap bean yield

2012 ◽  
Vol 12 (3) ◽  
pp. 206-210 ◽  
Author(s):  
Lanusse Cordeiro de Araújo ◽  
Geraldo de Amaral Gravina ◽  
Caillet Dornelles Marinho ◽  
Sebastião Ney Costa de Almeida ◽  
Rogério Figueiredo Daher ◽  
...  
Keyword(s):  
Block Design ◽  
High Rate ◽  
Snap Bean ◽  
High Magnitude ◽  
Path Coefficients ◽  
Randomized Block Design ◽  
Genotypic Association ◽  
Bean Yield ◽  
Selection For ◽  
Significant Direct Effect

Aiming to estimate the path coefficients among morphological traits and effects of production components on the yield of grains and pods, thirty snap bean genotypes (27 lines and three commercial controls) were evaluated in Bom Jesus of Itabapoana-RJ. The experiments were carried out in a randomized block design, with four replications, from May to June, in 2009 and 2010. Eight traits were evaluated and the number of pods per plant, associated with high genetic correlation, is the character with the most significant direct effect on productivity. There is a high rate of genotypic association between the yields of pods and grains, as well as direct effects of high magnitude and positive signal between them, indicating that the selection for increased pod yield allows increased grain yield.

Snap Bean (Phaseolus vulgaris) Tolerance to Halosulfuron PRE, POST, or PRE followed by POST

2006 ◽  
Vol 20 (4) ◽  
pp. 873-876 ◽  
Author(s):  
Brandy D. Silvey ◽  
Wayne E. Mitchem ◽  
Andrew W. Macrae ◽  
David W. Monks
Keyword(s):  
North Carolina ◽  
Phaseolus Vulgaris ◽  
Field Experiment ◽  
Plant Height ◽  
Linear Trend ◽  
Bean Plant ◽  
Snap Bean ◽  
Yellow Nutsedge ◽  
Crop Injury ◽  
Bean Yield

A field experiment was conducted in 1996 and 1997 to determine snap bean tolerance to halosulfuron based on crop injury, height, and yield. Halosulfuron was applied preemergence (PRE), postemergence (POST), and sequentially PRE followed by (fb) POST at 35, 53, and 70 g ai/ha, respectively. For comparison, a hand-weeded check was included. When data were averaged across years and halosulfuron rates, halosulfuron PRE, POST, and PRE fb POST provided similar yellow nutsedge control (74 to 82%) at snap bean harvest. Halosulfuron PRE resulted in 4% snap bean injury at harvest. Similarly, halosulfuron PRE fb POST resulted in 5% injury, while halosulfuron POST caused the most damage at 8%. Snap bean height at harvest was reduced 14% with halosulfuron POST compared to the weed-free check, with only 5 and 6% reduction caused by halosulfuron PRE and PRE fb POST, respectively. Halosulfuron POST reduced yield 39% compared to the weed-free check, while the PRE and PRE fb POST application timings produced yield similar to the check. When averaged across years and halosulfuron application timings, an increase in halosulfuron rate had no effect on yellow nutsedge control or snap bean yield. A linear trend was found for snap bean injury and plant height at harvest with snap bean injury increasing with an increase in halosulfuron rate while snap bean plant height decreased with an increase in halosulfuron rate. Application of halosulfuron PRE is the safest means to control yellow nutsedge in snap bean in North Carolina.

Neonicotinoid seed treatments for managing potato leafhopper infestations in snap bean

2004 ◽  
Vol 23 (2) ◽  
pp. 147-154 ◽  
Author(s):  
Brian A Nault ◽  
Alan G Taylor ◽  
Michael Urwiler ◽  
Tom Rabaey ◽  
William D Hutchison
Keyword(s):  
Potato Leafhopper ◽  
Seed Treatments ◽  
Snap Bean

scholarly journals Flooding Affects Snap Bean Yield and Genotypic Variation in Leaf Gas Exchange and Root Growth Response

1992 ◽  
Vol 117 (5) ◽  
pp. 711-716 ◽  
Author(s):  
Benyamin Lakitan ◽  
David W. Wolfe ◽  
Richard W. Zobel
Keyword(s):  
Leaf Gas Exchange ◽  
Genotypic Variation ◽  
Total Yield ◽  
Growth And Yield ◽  
Yield Response ◽  
Growth Stages ◽  
Snap Bean ◽  
Greenhouse Experiments ◽  
Blue Lake ◽  
Bean Yield

Greenhouse experiments were conducted in 1987 and 1988 to evaluate the effect of timing of a 4-day flooding stress on growth and yield of snap bean (Phaseolus vulgaris L. cv. Bush Blue Lake 274, BBL). Plant survival was reduced when flooding was imposed at postflowering growth stages, but most plants survived when flooded before flowering or when reproductive development was prevented by deflowering. Early yields of surviving plants were very low in all flooded treatments, regardless of timing, in both years. Total yield response to timing of flooding was linear in 1987, with lowest yields when flooding was imposed at later growth stages. The trend was not linear in 1988, but in both years the latest flooding treatment (36 days after planting) had few surviving plants and no measurable pod yield. Additional greenhouse experiments revealed that leaf conductance of BBL and another bean cultivar, Luna (LN), declined within the first day of flooding. This decline was concomitant with one in leaf water potential and photosynthesis (Pn) in BBL, but decline of these responses occurred 1 to 2 days later for LN. After 4 days of flooding, Pn fell to near 0 for BBL, and to 15% of the prestress value for LN. Pn of both cultivars had recovered to 18.5 μmol·m-2·s-1 10 days after termination of flooding. LN had a larger adventitious root biomass, higher percentage of adventitious roots, and a consistently lower leaf: root ratio than BBL during recovery.

Common Cocklebur (Xanthium strumarium) Interference in Snap Beans (Phaseolus vulgaris)

1990 ◽  
Vol 4 (4) ◽  
pp. 743-748 ◽  
Author(s):  
Philip E. Neary ◽  
Bradley A. Majek
Keyword(s):  
Phaseolus Vulgaris ◽  
Damage Threshold ◽  
Critical Duration ◽  
Xanthium Strumarium ◽  
Full Bloom ◽  
Snap Bean ◽  
Snap Beans ◽  
Bean Yield ◽  
Weed Removal

The effect of common cocklebur interference on snap beans was investigated at Bridgeton, NJ, in 1987 and 1988. Snap bean yields were reduced by increasing weed densities. Yields were reduced 8 to 44% in 1987 and 2 to 55% in 1988 by full-season in-row weed densities ranging from 0.5 to 8/m2. One weed and 4 weeds/m2were the damage-threshold populations of common cocklebur with full-season interference in 1987 and 1988, respectively. The weed-free requirement, after planting, was to the unifoliolate stage of snap beans. Common cocklebur at 4 weeds/m2did not affect yield when snap beans were maintained weed free until the unifoliolate stage of snap beans. The critical duration of interference for common cocklebur emerging with snap beans was between the emergence and full-bloom stage of snap beans. Snap bean yield was not reduced with weed removal at full bloom.

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