Agricultural Research Service (ARS) and University of California-Riverside (UCR) scientists have jointly identified a key component of the female psylla’s chemical sex attractant, or pheromone, which could set the stage for luring amorous males to their doom.
Entomologists Christelle Guédot, Dave Horton and Peter Landolt at the ARS Yakima Agricultural Research Laboratory in Wapato, Wash., discovered the compound, 13 methyl heptacosane (13-MeC27), in collaboration with Jocelyn Millar, a professor of entomology at UCR’s College of Natural and Agricultural Sciences.
Besides luring male psylla onto sticky traps, the compound’s discovery could give rise to lures for either monitoring the pest or disrupting its mating. Both approaches could diminish the reliance on insecticides—saving growers money, sparing beneficial insects, and forestalling the pest’s development of insecticide resistance.
Pear psylla’s most damaging stage is the nymph. The flat, red-eyed nymphal stage causes reductions in fruit quality as its honeydew drips onto and marks developing fruit. Heavy infestations cause premature leaf fall and loss of yield.
Researchers performed chemical analyses and behavioral assays to isolate and then identify the volatile chemicals extracted from female pear psylla that were most attractive to males. The team’s studies showed that 13-MeC27 was the most attractive of several chemicals evaluated. Laboratory assays were then done which confirmed that the attractiveness of the compound to males was equivalent to male response to females. Experiments in pear orchards confirmed that the compound is attractive to males and can be used to bait traps to capture pear psylla.
Under a patent application filed in September 2009 by ARS on behalf of the U.S. Department of Agriculture (USDA), the scientists intend to combine 13-MeC27 with other attractants to produce blends for use in pheromone dispensers, bait stations or traps.
The team published its findings in the Journal of Chemical Ecology.
ARS is USDA’s principal intramural scientific research agency. The research supports the USDA priority of promoting international food security.
Jan Suszkiw | EurekAlert!
Six-legged livestock -- sustainable food production
11.05.2017 | Faculty of Science - University of Copenhagen
Elephant Herpes: Super-Shedders Endanger Young Animals
04.05.2017 | Universität Zürich
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
26.05.2017 | Life Sciences
26.05.2017 | Life Sciences
26.05.2017 | Physics and Astronomy