Abstract
Potato leafhopper [PLH; Empoasca fabae (Harris)] is the most damaging pest of alfalfa ( Medicago sativa L.) in midwestern and eastern states. Our objective was to compare alfalfa populations with glandular‐hairs (PLH‐resistant) and susceptible populations for forage yield and quality, PLH damage, and PLH nymph and adult populations. Potato leafhopper‐resistant and susceptible alfalfa populations were planted in New York (NY) plot trials in 1997, 1998, and 1999, and compared seeding year through second production year. When PLH populations exceeded the action threshold for NY, PLH‐resistant populations had lower PLH damage scores (2.3 vs. 3.7), fewer number of nymphs per 10 stems (3.5 vs. 6.2), and fewer adult PLHs per five sweeps (9.1 vs. 18.1) than susceptible populations. However, PLH‐resistant populations yielded more than susceptible populations only in one of four trials. Irrespective of PLH damage level, PLH‐resistant populations had higher crude protein (CP) concentration (203 vs. 194 g kg −1 ) and matured earlier than susceptible populations. Seeding year trials were severely damaged by PLH. The following year at first harvest, PLH‐resistant populations yielded more than susceptible populations (0.24 Mg ha −1 more in 1997 trial, and 0.61 Mg ha −1 more in 1999 trial), even though PLHs were not causing economic damage. Resistant populations that were not treated with insecticide averaged lower total season yields than insecticide‐treated, PLH‐susceptible populations (0.29 Mg ha −1 less in seeding year, 0.95 Mg ha −1 less in production yrs). Potato leafhopper‐resistant populations provide benefits to growers such as higher CP concentration and less hopperburn, but do not provide complete protection against yield loss from PLH damage.
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Claims 13
Claim · model-written summary
Resistant alfalfa populations had lower potato leafhopper damage scores than susceptible populations (2.3 vs. 3.7).
- Taxon
- alfalfa
Medicago sativae2 - Material
- PLH‐resistant populationse1
- Interactor
- Potato leafhoppere2pest
- Outcome
- PLH damage scorese1
- Direction
- lowere1
- Value
- 2.3 vs. 3.7e1
- Comparator
- susceptible populationse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“PLH‐resistant populations had lower PLH damage scores (2.3 vs. 3.7), fewer number of nymphs per 10 stems (3.5 vs. 6.2), and fewer adult PLHs per five sweeps (9.1 vs. 18.1) than susceptible populations”
e2“Potato leafhopper [PLH; Empoasca fabae (Harris)] is the most damaging pest of alfalfa”
Claim · model-written summary
Resistant alfalfa populations had fewer nymphs per 10 stems than susceptible populations (3.5 vs. 6.2).
- Taxon
- alfalfaMedicago sativae2
- Material
- PLH‐resistant populationse1
- Interactor
- Potato leafhoppere2pest
- Outcome
- number of nymphs per 10 stemse1
- Direction
- fewere1
- Value
- 3.5 vs. 6.2e1
- Comparator
- susceptible populationse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“PLH‐resistant populations had lower PLH damage scores (2.3 vs. 3.7), fewer number of nymphs per 10 stems (3.5 vs. 6.2), and fewer adult PLHs per five sweeps (9.1 vs. 18.1) than susceptible populations”
e2“Potato leafhopper [PLH; Empoasca fabae (Harris)] is the most damaging pest of alfalfa”
Claim · model-written summary
Resistant alfalfa populations had fewer adult potato leafhoppers per five sweeps than susceptible populations (9.1 vs. 18.1).
- Taxon
- alfalfaMedicago sativae2
- Material
- PLH‐resistant populationse1
- Interactor
- Potato leafhoppere2pest
- Outcome
- adult PLHs per five sweepse1
- Direction
- fewere1
- Value
- 9.1 vs. 18.1e1
- Comparator
- susceptible populationse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“PLH‐resistant populations had lower PLH damage scores (2.3 vs. 3.7), fewer number of nymphs per 10 stems (3.5 vs. 6.2), and fewer adult PLHs per five sweeps (9.1 vs. 18.1) than susceptible populations”
e2“Potato leafhopper [PLH; Empoasca fabae (Harris)] is the most damaging pest of alfalfa”
Claim · model-written summary
Resistant alfalfa populations yielded more than susceptible populations in only one of four trials.
- Taxon
- alfalfaMedicago sativae2
- Material
- PLH‐resistant populationse3
- Outcome
- yieldede3
- Direction
- moree3
- Qualifier
- only in one of four trialse3
- Comparator
- susceptible populationse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“PLH‐resistant populations yielded more than susceptible populations only in one of four trials”
e2“Potato leafhopper [PLH; Empoasca fabae (Harris)] is the most damaging pest of alfalfa”
Claim · model-written summary
Irrespective of pest damage level, resistant alfalfa populations had higher crude protein concentration (203 vs. 194 g kg −1).
- Taxon
- alfalfaMedicago sativae2
- Material
- PLH‐resistant populationse5
- Outcome
- crude protein (CP) concentratione5
- Direction
- highere5
- Value
- 203 vs. 194 g kg −1e5
- Qualifier
- Irrespective of PLH damage levele5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Irrespective of PLH damage level, PLH‐resistant populations had higher crude protein (CP) concentration (203 vs. 194 g kg −1 )”
e2“Potato leafhopper [PLH; Empoasca fabae (Harris)] is the most damaging pest of alfalfa”
Claim · model-written summary
Resistant alfalfa populations matured earlier than susceptible populations.
- Taxon
- alfalfaMedicago sativae2
- Material
- PLH‐resistant populationse5
- Outcome
- maturede6
- Direction
- earliere6
- Comparator
- susceptible populationse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Irrespective of PLH damage level, PLH‐resistant populations had higher crude protein (CP) concentration (203 vs. 194 g kg −1 )”
e6“and matured earlier than susceptible populations”
e2“Potato leafhopper [PLH; Empoasca fabae (Harris)] is the most damaging pest of alfalfa”
Claim · model-written summary
Seeding year trials were severely damaged by potato leafhopper.
- Taxon
- alfalfaMedicago sativae2
- Interactor
- PLHe7pest
- Outcome
- Seeding year trials were severely damagede7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Seeding year trials were severely damaged by PLH”
e2“Potato leafhopper [PLH; Empoasca fabae (Harris)] is the most damaging pest of alfalfa”
Claim · model-written summary
Resistant alfalfa populations yielded 0.24 Mg/ha more than susceptible populations in the 1997 trial.
- Taxon
- alfalfaMedicago sativae2
- Material
- PLH‐resistant populationse4
- Outcome
- yieldede4
- Direction
- moree4
- Value
- 0.24 Mg ha −1e4
- Comparator
- susceptible populationse4
- Setting
- 1997 triale4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“PLH‐resistant populations yielded more than susceptible populations (0.24 Mg ha −1 more in 1997 trial, and 0.61 Mg ha −1 more in 1999 trial”
e2“Potato leafhopper [PLH; Empoasca fabae (Harris)] is the most damaging pest of alfalfa”
Claim · model-written summary
Resistant alfalfa populations yielded 0.61 Mg/ha more than susceptible populations in the 1999 trial.
- Taxon
- alfalfaMedicago sativae2
- Material
- PLH‐resistant populationse4
- Outcome
- yieldede4
- Direction
- moree4
- Value
- 0.61 Mg ha −1e4
- Comparator
- susceptible populationse4
- Setting
- 1999 triale4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“PLH‐resistant populations yielded more than susceptible populations (0.24 Mg ha −1 more in 1997 trial, and 0.61 Mg ha −1 more in 1999 trial”
e2“Potato leafhopper [PLH; Empoasca fabae (Harris)] is the most damaging pest of alfalfa”
Claim · model-written summary
Alfalfa populations not treated with insecticide had lower total season yields than insecticide-treated susceptible populations in the seeding year (0.29 Mg/ha less).
- Taxon
- alfalfaMedicago sativae2
- Material
- Resistant populationse5
- Treatment
- not treated with insecticidee5
- Outcome
- total season yieldse5
- Direction
- lowere5
- Value
- 0.29 Mg ha −1e5
- Comparator
- insecticide‐treated, PLH‐susceptible populationse5
- Setting
- seeding yeare5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Resistant populations that were not treated with insecticide averaged lower total season yields than insecticide‐treated, PLH‐susceptible populations (0.29 Mg ha −1 less in seeding year, 0.95 Mg ha −1 less in production yrs)”
e2“Potato leafhopper [PLH; Empoasca fabae (Harris)] is the most damaging pest of alfalfa”
Claim · model-written summary
Alfalfa populations not treated with insecticide had lower total season yields than insecticide-treated susceptible populations in production years (0.95 Mg/ha less).
- Taxon
- alfalfaMedicago sativae2
- Material
- Resistant populationse5
- Treatment
- not treated with insecticidee5
- Outcome
- total season yieldse5
- Direction
- lowere5
- Value
- 0.95 Mg ha −1e5
- Comparator
- insecticide‐treated, PLH‐susceptible populationse5
- Setting
- production yrse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Resistant populations that were not treated with insecticide averaged lower total season yields than insecticide‐treated, PLH‐susceptible populations (0.29 Mg ha −1 less in seeding year, 0.95 Mg ha −1 less in production yrs)”
e2“Potato leafhopper [PLH; Empoasca fabae (Harris)] is the most damaging pest of alfalfa”
Claim · model-written summary
Resistant populations do not give complete protection against yield loss from potato leafhopper damage.
- Taxon
- alfalfaMedicago sativae2
- Material
- Potato leafhopper‐resistant populationse6
- Interactor
- PLHe6pest
- Outcome
- yield loss from PLH damagee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Potato leafhopper‐resistant populations provide benefits to growers such as higher CP concentration and less hopperburn, but do not provide complete protection against yield loss from PLH damage”
e2“Potato leafhopper [PLH; Empoasca fabae (Harris)] is the most damaging pest of alfalfa”
Claim · model-written summary
Resistant populations provide less hopperburn.
- Taxon
- alfalfaMedicago sativae2
- Material
- Potato leafhopper‐resistant populationse6
- Outcome
- less hopperburne6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Potato leafhopper‐resistant populations provide benefits to growers such as higher CP concentration and less hopperburn, but do not provide complete protection against yield loss from PLH damage”
e2“Potato leafhopper [PLH; Empoasca fabae (Harris)] is the most damaging pest of alfalfa”
The same questions in other papers
insecticide · yield · Medicago sativa (alfalfa)Results differ
7 papers in the same direction as this paper · 17 in the opposite direction
- positive
- positive
- positive
21 papers more in this group
See all 25 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.