4 research outputs found
Behavioural response (mean numberĀ± SE) of <i>Cicadulina storeyi</i> adult leafhoppers to VOCs collected from <i>cis</i>-jasmone (CJ)-treated, adult <i>C. storeyi</i>-infested maize (<i>Zea mays</i>) seedlings versus VOCs collected from control-treated, adult <i>C. storeyi</i>-infested maize seedlings in a Y-tube olfactometer.
<p>VOCs were collected 0ā3 h, 3ā6 h, 6ā22 h, 22ā30 h, 30ā46 h, 46ā54 h, 54ā70 h and 70ā78 h after addition of <i>C. storeyi</i>. nā=ā10. Data were analysed using a paired <i>t</i>-test. ***<i>P</i><0.001. White columnsā=ācontrol treatment, then <i>C. storeyi</i> infestation. Grey columnsā=āCJ treatment, then <i>C. storeyi</i> infestation.</p
Mean quantities (Ā± SE) of VOCs released by maize(<i>Zea mays</i>) seedlings following either CJ or control treatment, and then wounding+JA exposure 24 h later.
<p>VOCs were collected every 24 h over a continuous 96 h period. Aā=ā24 h period between CJ or control treatment and wounding+JA exposure; Bā=ā0ā24 h after wounding+JA exposure; Cā=ā24ā48 h after wounding+JA exposure; Dā=ā48ā72 h after wounding+JA exposure. (<i>E</i>)-4,8-dimethyl-1,3,7-nonatrieneā=āDMNT; (<i>E,E</i>)-4,8,12-dimethyl-1,3,7,11-tridecatetraeneā=āTMTT. Data were expressed as nanograms of VOC released per 24 h collection period (9 plants were used per treatment) and were analysed using paired <i>t</i>-tests *<i>P</i><0.05. nā=ā4. Grey columnsā=āCJ treatment, then wounding+JA. White columnsā=ācontrol treatment, then wounding+JA.</p
Mean quantities (log<sub>10</sub>ng) of sesquiterpene VOCs and DMNT emitted by maize (<i>Zea mays</i>) seedlings following either <i>cis</i>-jasmone (CJ) or control treatment and then addition of <i>Cicadulina storeyi</i> (adults, nā=ā9 or nymphs, nā=ā10) 24 h later.
<p>VOCs were collected after <i>C. storeyi</i> addition during the following time periods: 0ā6 h, 6ā22 h, 22ā30 h, 30ā46 h, 46ā54 h, 54ā70 h and 70ā78 h. Data were analysed using a split-plot in time ANOVA. Appropriate means were compared using LSD (5%) values.</p>*<p>For comparisons of treatments with or without CJ.</p>**<p>For all other comparisons. For the 0ā6 h collection period, means with superscript letters a and b within the same column are significantly different (<i>P</i><0.05 LSD).</p
Revisiting the Male-Produced Aggregation Pheromone of the Lesser Mealworm, Alphitobius diaperinus (Coleoptera, Tenebrionidae): Identification of a Six-Component Pheromone from a Brazilian Population
The
lesser mealworm, Alphitobius diaperinus Panzer 1797 (Coleoptera: Tenebrionidae), is a cosmopolitan insect
pest affecting poultry production. Due to its cryptic behavior, insecticide
control is usually not efficient. Thus, sustainable and effective
methods would have an enormous and positive impact in poultry production.
The aim of this study was to confirm the identity of the male-produced
aggregation pheromone for a Brazilian population of A. diaperinus and to evaluate its biological activity
in behavioral assays. Six male-specific compounds were identified:
(<i>R</i>)-limonene (<b>1</b>), (<i>E</i>)-ocimene (<b>2</b>), 2-nonanone (<b>3</b>), (<i>S</i>)-linalool (<b>4</b>), (<i>R</i>)-daucene
(<b>5</b>), all described before in an American population,
and a sixth component, (<i>E</i>,<i>E</i>)-Ī±-farnesene (<b>6</b>),
which is apparently exclusive to a Brazilian population. Y-Tube bioassays
confirmed the presence of a male-produced aggregation pheromone and
showed that all components need to be present in a similar ratio and
concentration as emitted by male A. diaperinus to produce a positive chemotactic response