منابع مشابه
Acoustic surveying of subterranean insect populations in citrus groves.
Subterranean insect pests cause considerable economic damage but their concealment makes detection difficult. A portable acoustic system was developed and tested for its potential to rate the likelihood that trees in citrus groves were infested with Diaprepes abbreviatus (L.) larvae. The likelihood was rated independently by a computer program and an experienced listener that distinguished inse...
متن کاملRapid surveying of DNA sequence variation in natural populations.
DNA sequencing can be costly and time consuming for population studies because of the relative rarity of variation along exons. These problems can be substantially reduced by the use of the polymerase chain reaction on introns using primers from the exon region. These problems can be further reduced by the use of denaturing gradient gel electrophoresis to identify those alleles in need of seque...
متن کاملSurveying Predicted Rendezvous Sites to Monitor Gray Wolf Populations
We used rendezvous site locations of wolf (Canis lupus) packs recorded during 1996–2006 to build a predictive model of gray wolf rendezvous site habitat in Idaho, USA. Variables in our best model included green leaf biomass (Normalized Difference Vegetation Index), surface roughness, and profile curvature, indicating that wolves consistently used wet meadow complexes for rendezvous sites. We th...
متن کاملIncidence of the Beet Leafhopper-Transmitted Virescence Agent Phytoplasma in local Populations of the Beet Leafhopper, Circulifer tenellus, in Washington State
Phytoplasma diseases are increasingly becoming important in vegetable crops in the Pacific Northwest. Recently, growers in the Columbia Basin and Yakima Valley experienced serious outbreaks of potato purple top disease that caused significant yield loss and a reduction in tuber processing quality. It was determined that the beet leafhopper-transmitted virescence agent (BLTVA) phytoplasma was th...
متن کاملActive Surveying
Opinion leaders play an important role in influencing people’s opinions, actions and behaviors. Although a number of methods have been proposed in literature for identifying influentials using secondary sources of information, the true set of opinion leaders revealed through primary sources, such as surveys, is still favored in many domains. In this work, we present a new active learning method...
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ژورنال
عنوان ژورنال: California Agriculture
سال: 1965
ISSN: 0008-0845
DOI: 10.3733/ca.v019n04p7