Abstract
Glandular‐haired alfalfa ( Medicago sativa L.) cultivars developed for resistance to potato leafhopper [ Empoasca fabae Harris] (PLH) have not been evaluated across a wide geographic area. Our objective was to evaluate forage growth, yield, insect damage, and stand density of glandular‐haired and standard alfalfa cultivars with and without insecticide control of naturally occurring PLH infestations across the Midwest USA. Nine glandular‐haired and five standard cultivars were evaluated from 1996 to 1998 in field experiments in Ohio, Indiana, Wisconsin, and Minnesota. Scheduled insecticide applications increased total yield of all cultivars, the response declining with increasing latitude (yield advantage = 32.7 − 0.72 × latitude; r 2 = 0.86, P = 0.05). Depending on location, total yield loss due to PLH damage ranged from 5 to 23% for the standard cultivars and 1 to 10% for the glandular‐haired, commercially released cultivars (GR). Yield loss from PLH feeding in the GR cultivars was less than half of that observed in standard cultivars in environments where PLH stress was high. The GR cultivars yielded 1.1 Mg ha −1 more per year on average than the standard cultivars without insecticide under high PLH stress in Ohio and Indiana. Potato leafhopper nymph densities were lower in glandular‐haired cultivars than in standard cultivars. Cultivars had similar yield when treated with insecticide or when PLH populations were low. Glandular‐haired alfalfa cultivars were not immune to PLH damage; however, they can substantially reduce yield losses caused by this pest and provide a useful new tool for integrated pest management strategies.
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Claims 10
Claim · model-written summary
Scheduled insecticide applications increased total alfalfa yield across cultivars.
- Taxon
- Medicago sativa L.
Medicago sativae0 - Treatment
- Scheduled insecticide applicationse3
- Interactor
- potato leafhoppere1pest
- Outcome
- total yielde3
- Direction
- increasede3
- Comparator
- without insecticide controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.) cultivars”
e1“potato leafhopper [ Empoasca fabae Harris] (PLH)”
e2“with and without insecticide control of naturally occurring PLH infestations”
e3“Scheduled insecticide applications increased total yield of all cultivars, the response declining with increasing latitude”
Claim · model-written summary
The yield response to insecticide declined with increasing latitude.
- Taxon
- Medicago sativa L.Medicago sativae0
- Outcome
- responsee3
- Direction
- declininge3
- Qualifier
- r 2 = 0.86, P = 0.05e4
- Setting
- increasing latitudee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.) cultivars”
e3“Scheduled insecticide applications increased total yield of all cultivars, the response declining with increasing latitude”
e4“r 2 = 0.86, P = 0.05”
Claim · model-written summary
Total yield loss from potato leafhopper damage in standard alfalfa cultivars ranged from 5 to 23%.
- Taxon
- Medicago sativa L.Medicago sativae0
- Material
- standard cultivarse5
- Interactor
- potato leafhoppere1pest
- Outcome
- total yield loss due to PLH damagee5
- Value
- 5 to 23%e5
- Qualifier
- Depending on locatione5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.) cultivars”
e1“potato leafhopper [ Empoasca fabae Harris] (PLH)”
e5“Depending on location, total yield loss due to PLH damage ranged from 5 to 23% for the standard cultivars and 1 to 10% for the glandular”
Claim · model-written summary
Total yield loss from potato leafhopper damage in commercially released GR cultivars ranged from 1 to 10%.
- Taxon
- Medicago sativa L.Medicago sativae0
- Material
- commercially released cultivars (GR)e6
- Interactor
- potato leafhoppere1pest
- Outcome
- total yield loss due to PLH damagee5
- Value
- 1 to 10%e5
- Qualifier
- Depending on locatione5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.) cultivars”
e1“potato leafhopper [ Empoasca fabae Harris] (PLH)”
e5“Depending on location, total yield loss due to PLH damage ranged from 5 to 23% for the standard cultivars and 1 to 10% for the glandular”
e6“commercially released cultivars (GR)”
Claim · model-written summary
Yield loss from PLH feeding in GR cultivars was less than half of that in standard cultivars where PLH stress was high.
- Taxon
- Medicago sativa L.Medicago sativae0
- Material
- GR cultivarse7
- Interactor
- PLHe7pest
- Outcome
- Yield loss from PLH feedinge7
- Direction
- less than halfe7
- Comparator
- standard cultivarse7
- Setting
- environments where PLH stress was highe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.) cultivars”
e1“potato leafhopper [ Empoasca fabae Harris] (PLH)”
e7“Yield loss from PLH feeding in the GR cultivars was less than half of that observed in standard cultivars in environments where PLH stress was high”
Claim · model-written summary
GR cultivars yielded 1.1 more per year on average than standard cultivars without insecticide under high PLH stress in Ohio and Indiana.
- Taxon
- Medicago sativa L.Medicago sativae0
- Material
- GR cultivarse2
- Treatment
- high PLH stresse3
- Interactor
- potato leafhoppere1pest
- Outcome
- yielde2
- Direction
- moree3
- Value
- 1.1e2
- Qualifier
- per year on averagee3
- Comparator
- standard cultivars without insecticidee3
- Setting
- Ohio and Indianae3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.) cultivars”
e1“potato leafhopper [ Empoasca fabae Harris] (PLH)”
e2“The GR cultivars yielded 1.1”
e3“more per year on average than the standard cultivars without insecticide under high PLH stress in Ohio and Indiana”
Claim · model-written summary
Potato leafhopper nymph densities were lower in glandular-haired cultivars than in standard cultivars.
- Taxon
- Medicago sativa L.Medicago sativae0
- Material
- glandulare2
- Outcome
- nymph densitiese2
- Direction
- lowere2
- Comparator
- standard cultivarse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.) cultivars”
e1“potato leafhopper [ Empoasca fabae Harris] (PLH)”
e2“Potato leafhopper nymph densities were lower in glandular”
e3“than in standard cultivars”
Claim · model-written summary
Cultivars had similar yield when treated with insecticide or when potato leafhopper populations were low.
- Taxon
- Medicago sativa L.Medicago sativae0
- Treatment
- treated with insecticidee1
- Outcome
- yielde1
- Direction
- similare1
- Qualifier
- when PLH populations were lowe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.) cultivars”
e1“Cultivars had similar yield when treated with insecticide or when PLH populations were low”
Claim · model-written summary
Glandular-haired alfalfa cultivars were not immune to potato leafhopper damage.
- Taxon
- Medicago sativa L.Medicago sativae0
- Interactor
- potato leafhoppere1pest
- Outcome
- immune to PLH damagee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.) cultivars”
e1“potato leafhopper [ Empoasca fabae Harris] (PLH)”
e2“were not immune to PLH damage”
Claim · model-written summary
Glandular-haired cultivars are a useful new tool for integrated pest management of potato leafhopper.
- Taxon
- Medicago sativa L.Medicago sativae0
- Outcome
- a useful new tool for integrated pest management strategiese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.) cultivars”
e1“provide a useful new tool for integrated pest management strategies”
The same questions in other papers
insecticide · yield · Medicago sativa (alfalfa)Results differ
16 papers in the same direction as this paper · 7 in the opposite direction · 1 reporting no difference from an alternative
- 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.