Abstract
Abstract Although the alfalfa weevil [ Hypera postica (Gyllenhal)] is an important insect pest of alfalfa ( Medicago sativa L.), relatively little is known about how larval defoliation affects growth processes at specific developmental stages. This study was conducted to characterize the developmental responses of alfalfa to simulated alfalfa weevil injury when injury was initiated at the early‐bud stage of the first growth cycle. The study was conducted on a Sharpsburg silty clay loam (fine, montmorillonitic, mesic, Typic Argiudolls) in a 3.6 ha ‘Haymaker’ alfalfa field near Walton, NE. A total of 16 1‐by 1‐m plots were arranged in a randomized complete block design with four treatments in each of four replicates. Treatments consisted of an undefoliated check and three levels of simulated alfalfa weevil defoliation. Morphological effects of simulated alfalfa weevil injury were determined at five postdefoliation periods. Leaf area indices, leaf area to total dry weight ratios, and leaf dry weight to total dry weight ratios were reduced linearly as defoliation percentages increased. However, defoliation injury did not affect phenological development of the first growth cycle between the completion of injury and first harvest. Most growth rates were not different among treatments, indicating that there was no postdefoliation compensatory growth. Injury initiated at the early‐bud stage of the first growth cycle did not impact alfalfa regrowth after the first harvest. Consequently, the most important effect of defoliation initiated at the early‐bud stage of the first growth cycle was to reduce dry matter yield of the first growth.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 5
Claim · model-written summary
Simulated weevil defoliation linearly reduced leaf area index and leaf area and leaf dry weight ratios to total dry weight as defoliation increased.
- Taxon
- alfalfa
Medicago sativae0 - Treatment
- simulated alfalfa weevil defoliatione2
- Interactor
- alfalfa weevil
Hypera posticae2pest - Outcome
- Leaf area indices, leaf area to total dry weight ratios, and leaf dry weight to total dry weight ratiose1
- Direction
- reducede1
- Qualifier
- linearly as defoliation percentages increasede1
- Comparator
- undefoliated checke2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“insect pest of alfalfa ( Medicago sativa L.)”
e1“Leaf area indices, leaf area to total dry weight ratios, and leaf dry weight to total dry weight ratios were reduced linearly as defoliation percentages increased”
e2“Treatments consisted of an undefoliated check and three levels of simulated alfalfa weevil defoliation”
Claim · model-written summary
Defoliation did not affect phenological development of the first growth cycle between injury and first harvest.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- defoliation injurye3
- Outcome
- phenological development of the first growth cyclee3
- Direction
- did not affecte3
- Comparator
- undefoliated checke2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“insect pest of alfalfa ( Medicago sativa L.)”
e2“Treatments consisted of an undefoliated check and three levels of simulated alfalfa weevil defoliation”
e3“defoliation injury did not affect phenological development of the first growth cycle between the completion of injury and first harvest”
Claim · model-written summary
Most growth rates did not differ among simulated weevil defoliation treatments, indicating no postdefoliation compensatory growth.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- simulated alfalfa weevil defoliatione2
- Outcome
- growth ratese4
- Direction
- were not differente4
- Comparator
- among treatmentse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“insect pest of alfalfa ( Medicago sativa L.)”
e2“Treatments consisted of an undefoliated check and three levels of simulated alfalfa weevil defoliation”
e4“Most growth rates were not different among treatments”
Claim · model-written summary
Injury initiated at the early-bud stage did not impact alfalfa regrowth after the first harvest.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- Injury initiated at the early‐bud stage of the first growth cyclee5
- Outcome
- alfalfa regrowth after the first harveste5
- Direction
- did not impacte5
- Comparator
- undefoliated checke2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“insect pest of alfalfa ( Medicago sativa L.)”
e2“Treatments consisted of an undefoliated check and three levels of simulated alfalfa weevil defoliation”
e5“Injury initiated at the early‐bud stage of the first growth cycle did not impact alfalfa regrowth after the first harvest”
Claim · model-written summary
Defoliation at the early-bud stage mainly reduced dry matter yield of the first growth.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- defoliatione6
- Outcome
- dry matter yield of the first growthe7
- Direction
- reducee7
- Comparator
- undefoliated checke2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“insect pest of alfalfa ( Medicago sativa L.)”
e2“Treatments consisted of an undefoliated check and three levels of simulated alfalfa weevil defoliation”
e6“the most important effect of defoliation”
e7“was to reduce dry matter yield of the first growth”
The same questions in other papers
pruning · yield · Medicago sativa (alfalfa)Results differ
32 papers in the same direction as this paper · 40 in the opposite direction
- negative
- negative
- positive
69 papers more in this group
See all 73 papers →pruning · growth · Medicago sativa (alfalfa)Positive and negative results
19 papers in the same direction as this paper · 23 in the opposite direction
- positive
- positive
- positive
39 papers more in this group
See all 43 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.