Claim · model-written summary
The authors recommend that economic-threshold research for Hypera focus on quantitative evaluation of the larval population rather than visual damage patterns.
- Outcome
- quantitative evaluation of the larval populatione4
HyperaVerbatim
e4“it is recommended that research on development of economic thresholds for Hypera focus on quantitative evaluation of the larval population itself rather than on visual damage patterns”
Title
Visual Economic Thresholds and Potential Pesticide Abuse: Alfalfa Weevils,1an Example2
Warren R. Cothran; Charles G. Summers Environmental Entomology 1974. doi:10.1093/ee/3.6.891
Other claims from this paper (5)
- Observation Alfalfa plant-tips with moderate visible damage by Hypera brunneipennis larvae did not differ significantly in quantitative losses from undamaged tips.
- Observation Quantitative losses in alfalfa differed significantly between the severe damage category and the moderate and undamaged categories.
- Observation Modified crude fiber and protein of alfalfa plant-tips differed among the damage categories.
- Observation Calcium and phosphorus of alfalfa plant-tips differed among the damage categories.
- Recommendation The authors criticize visual-damage insecticide-treatment indexes at or below the moderate damage level, used for H. postica, as potential pesticide abuse.