Abstract
The clover leaf weevil (Hypera punctata F.) is a sporadic but potentially serious pest of alfalfa (Medicago sativa L.). Feeding of newly emerged adult fourth instar clover leaf weevil was simulated in a field study at the University of Nebraska Haskell Agricultural Research Lab near Concord, Nebraska, in May 2001 and 2002. Twelve 1- by 1-m plots were arranged in a randomized complete block design with three treatments and four replications. Treatments consisted of two levels of simulated clover leaf weevil defoliation of alfalfa and an undefoliated check. Leaflets were removed over 10 d. Dry matter yield and other plant responses were measured during the first two growth cycles. Yield differences among all three treatments were significant for the first growth cycle. The relationship be-tween percentage defoliation and percentage yield reduction was linear both years. Defoliation did not significantly affect percentages of acid detergent fiber, neutral detergent fiber, and protein. Alfalfa development also was not significantly affected in the second growth cycle. Dry matter yield reduction as a result of leaf removal at the early bud stage was the most important effect of first growth cycle defoliation.
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Claims 3
Claim · model-written summary
Percentage yield reduction rose linearly with percentage defoliation in both years.
- Taxon
- alfalfa
Medicago sativat0 - Treatment
- percentage defoliatione0
- Outcome
- percentage yield reductione0
- Qualifier
- both yearse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationship be-tween percentage defoliation and percentage yield reduction was linear both years”
t0“Alfalfa:Simulated Clover Leaf Weevil Injury”
Claim · model-written summary
Defoliation did not significantly affect acid detergent fiber, neutral detergent fiber or protein percentages.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Defoliatione0
- Outcome
- percentages of acid detergent fiber, neutral detergent fiber, and proteine0
- Direction
- did not significantly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Defoliation did not significantly affect percentages of acid detergent fiber, neutral detergent fiber, and protein”
t0“Alfalfa:Simulated Clover Leaf Weevil Injury”
Claim · model-written summary
Leaf removal at early bud stage reduced dry matter yield in the first growth cycle.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- leaf removal at the early bud stagee0
- Outcome
- Dry matter yielde0
- Direction
- reductione0
- Qualifier
- first growth cyclee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter yield reduction as a result of leaf removal at the early bud stage was the most important effect of first growth cycle defoliation”
t0“Alfalfa:Simulated Clover Leaf Weevil Injury”
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