Population Responses of Potato Leafhopper (Hemiptera: Cicadellidae) to Insecticide in Glandular-Haired and Non-Glandular-Haired Alfalfa Cultivars

Conflicting results have been reported on the ability of glandular-haired alfalfa (Medicago sativa L.) cultivars to reduce potato leafhopper, Empoasca fabae Harris, population abundance in field environments. We measured potato leafhopper adult and nymph abundance and yield responses in a cultivar s...

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Bibliographic Details
Published in:Journal of economic entomology 2014-12, Vol.107 (6), p.2077-2087
Main Authors: Sulc, R. Mark, Mccormick, John S., Hammond, Ronald B., Miller, David J.
Format: Article
Language:English
Subjects:
Abundance
Agricultural practices
Alfalfa
Animals
Crops, Agricultural - economics
Cultivars
FIELD AND FORAGE CROPS
forage yield
glandular-haired alfalfa
Harvesting
Hemiptera
host resistance
insecticide
Insecticide resistance
Insecticides
Insecticides - economics
Integrated pest management
Medicago sativa - anatomy & histology
Medicago sativa - growth & development
Pest control
Pest resistance
Population Density
potato leafhopper
Potatoes
Vegetables
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Summary:Conflicting results have been reported on the ability of glandular-haired alfalfa (Medicago sativa L.) cultivars to reduce potato leafhopper, Empoasca fabae Harris, population abundance in field environments. We measured potato leafhopper adult and nymph abundance and yield responses in a cultivar selected for high potato leafhopper resistance (‘54H91’) and in a non-glandular-haired susceptible cultivar (‘54V54’) with and without insecticide treatment across 3 yr. Treatments included no insecticide and insecticide applied either early or late in each summer growth cycle. Date × cultivar × treatment interactions were found for potato leafhopper population abundance. In the absence of insecticides, total potato leafhopper abundance (adults + nymphs per sweep) was lower in 54H91 than in 54V54 on 85% of sampling dates; cultivar differences were especially evident as potato leafhopper abundance peaked. Insecticide treatment reduced potato leafhopper populations in both cultivars, but populations recovered and often exceeded the normal action threshold in both cultivars within 2–3 wk of insecticide application. Yield gain from early insecticide treatment of 54V54 was >400 kg/ha in 11 of 14 summer harvests, whereas in 54H91 the yield gain was
ISSN:0022-0493
1938-291X
0022-0493
DOI:10.1603/EC14205