Abstract
Abstract Alfalfa ( Medicago sativa L.) mixtures with grasses, especially timothy ( Phleum pratense L.), are widely planted in the Great Lakes Region, but most information on potato leafhopper [ Empoasca fabae (Harris)] (PLH) management for new stands is based on alfalfa monocultures. Field research was conducted in 1991 and 1992 to evaluate the ability of alfalfa to recover from PLH injury following insecticide application and to compare the effect of injury on yield and quality of first‐year monocultures or mixtures. Four replicates of alfalfa monoculture and alfalfa‐timothy mixtures were established each year. One week after the first harvest in early July, eight split‐plot treatments were established in each main plot: an uncaged check, a caged check, and six combinations of two PLH infestation densities (25 or 50 PLH adults m −2 ) and three insecticide application dates (1 wk after infesting plots, 3 wk after infesting plots, and unsprayed). Crop mixture had no effect on PLH nymphal populations on a per stem basis. Although differences between years were noted, delaying insecticide application generally reduced forage yield and quality, delayed crop maturity, and increased weed content, particularly in forage mixtures. There was little evidence that seedling timothy could compensate for PLH injury to alfalfa. Data on stem elongation and dry matter accumulation indicated that alfalfa can recover from leafhopper injury; however, dry matter production did not increase for at least 2 to 3 wk following a spray application. Reductions in forage crude protein due to PLH injury were a result of both reduced crude protein content in the alfalfa and an increase in the proportion of weed biomass in the forage. Early detection and rapid response to economically significant populations are necessary to realize the greatest benefit from treatment. The presence of timothy in the mixture does not alter PLH management recommendations for new stands.
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Claims 11
Claim · model-written summary
Crop mixture had no effect on potato leafhopper nymphal populations.
- Taxon
- Alfalfa
Medicago sativae0 - Treatment
- Crop mixturee1
- Interactor
- Potato Leafhoppert0pest
- Outcome
- PLH nymphal populationse1
- Direction
- had no effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.) mixtures with grasses”
e1“Crop mixture had no effect on PLH nymphal populations on a per stem basis”
t0“Potato Leafhopper Management”
Claim · model-written summary
Delaying insecticide application reduced alfalfa forage yield and quality.
- Taxon
- AlfalfaMedicago sativae0
- Treatment
- delaying insecticide applicatione1
- Outcome
- forage yield and qualitye1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.) mixtures with grasses”
e1“delaying insecticide application generally reduced forage yield and quality”
Claim · model-written summary
Delaying insecticide application delayed alfalfa crop maturity.
- Taxon
- AlfalfaMedicago sativae0
- Treatment
- delaying insecticide applicatione1
- Outcome
- crop maturitye2
- Direction
- delayede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.) mixtures with grasses”
e1“delaying insecticide application generally reduced forage yield and quality”
e2“delayed crop maturity”
Claim · model-written summary
Delaying insecticide application increased weed content, particularly in forage mixtures.
- Taxon
- AlfalfaMedicago sativae0
- Treatment
- delaying insecticide applicatione1
- Outcome
- weed contente2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.) mixtures with grasses”
e1“delaying insecticide application generally reduced forage yield and quality”
e2“increased weed content, particularly in forage mixtures”
Claim · model-written summary
PLH injury reduced forage crude protein in alfalfa.
- Taxon
- AlfalfaMedicago sativae0
- Treatment
- PLH injurye1
- Interactor
- PLHe1pest
- Outcome
- forage crude proteine1
- Direction
- Reductionse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.) mixtures with grasses”
e1“Reductions in forage crude protein due to PLH injury were a result of both reduced crude protein content in the alfalfa and an increase in the proportion of weed biomass in the forage”
Claim · model-written summary
Reduced crude protein under PLH injury was partly due to an increase in the proportion of weed biomass in the forage.
- Taxon
- AlfalfaMedicago sativae0
- Outcome
- crude proteine1
- Qualifier
- an increase in the proportion of weed biomasse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.) mixtures with grasses”
e1“Reductions in forage crude protein due to PLH injury were a result of both reduced crude protein content in the alfalfa and an increase in the proportion of weed biomass in the forage”
Claim · model-written summary
Alfalfa can recover from potato leafhopper injury.
- Taxon
- alfalfaMedicago sativae1
- Outcome
- recover from leafhopper injurye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa can recover from leafhopper injury”
Claim · model-written summary
Dry matter production did not increase for at least 2 to 3 weeks after a spray application.
- Taxon
- AlfalfaMedicago sativae0
- Treatment
- spray applicatione1
- Outcome
- dry matter productione1
- Direction
- did not increasee1
- Value
- at least 2 to 3 wke1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.) mixtures with grasses”
e1“dry matter production did not increase for at least 2 to 3 wk following a spray application”
Claim · model-written summary
There was little evidence that seedling timothy compensated for PLH injury to alfalfa.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- PLH injurye1
- Outcome
- compensatee1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.) mixtures with grasses”
e1“There was little evidence that seedling timothy could compensate for PLH injury to alfalfa”
Claim · model-written summary
Early detection and rapid response to economically significant potato leafhopper populations are necessary.
- Taxon
- AlfalfaMedicago sativae0
- Outcome
- Early detection and rapid responsee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.) mixtures with grasses”
e1“Early detection and rapid response to economically significant populations are necessary to realize the greatest benefit from treatment”
Claim · model-written summary
The presence of timothy in the mixture does not change potato leafhopper management recommendations for new stands.
- Taxon
- AlfalfaMedicago sativae0
- Outcome
- PLH management recommendationse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.) mixtures with grasses”
e1“The presence of timothy in the mixture does not alter PLH management recommendations for new stands”
The same questions in other papers
application · yield · Medicago sativa (alfalfa)Positive and negative results
6 papers in the same direction as this paper · 31 in the opposite direction
- positive
- positive
- positive
34 papers more in this group
See all 38 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.