Aphid plant interactions
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What Would Aphids Do? | Science Buzz

What Would Aphids Do? | Science Buzz | Aphid plant interactions | Scoop.it

"Some gall-forming aphids species have “soldiers,” individuals that crowd around the rupture in the gall and—get this—puke out sticky goo to cover the hole. As much as two thirds of a soldier’s bodyweight can be comprised of the goo. The soldiers mix the goo with their legs, until it hardens into a crusty little “scab.” The goo is so sticky and quick-drying, in fact, that soldiers often become trapped in it, their own bodies building the gall scab."

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PLOS ONE: Priming of Production in Maize of Volatile Organic Defence Compounds by the Natural Plant Activator cis-Jasmone

PLOS ONE: Priming of Production in Maize of Volatile Organic Defence Compounds by the Natural Plant Activator cis-Jasmone | Aphid plant interactions | Scoop.it
Abstract

cis-Jasmone (CJ) is a natural plant product that activates defence against herbivores in model and crop plants. In this study, we investigated whether CJ could prime defence in maize, Zea mays, against the leafhopper, Cicadulina storeyi, responsible for the transmission of maize streak virus (MSV). Priming occurs when a pre-treatment, in this case CJ, increases the potency and speed of a defence response upon subsequent attack on the plant. Here, we tested insect responses to plant volatile organic compounds (VOCs) using a Y-tube olfactometer bioassay. Our initial experiments showed that, in this system, there was no significant response of the herbivore to CJ itself and no difference in response to VOCs collected from unexposed plants compared to CJ exposed plants, both without insects. VOCs were then collected from C. storeyi-infested maize seedlings with and without CJ pre-treatment. The bioassay revealed a significant preference by this pest for VOCs from infested seedlings without the CJ pre-treatment. A timed series of VOC collections and bioassays showed that the effect was strongest in the first 22 h of insect infestation, i.e. before the insects had themselves induced a change in VOC emission. Chemical analysis showed that treatment of maize seedlings with CJ, followed by exposure to C. storeyi, led to a significant increase in emission of the defensive sesquiterpenes (E)-(1R,9S)-caryophyllene, (E)-α-bergamotene, (E)-β-farnesene and (E)-4,8-dimethyl-1,3,7-nonatriene, known to act as herbivore repellents. The chemical analysis explains the behavioural effects observed in the olfactometer, as the CJ treatment caused plants to emit a blend of VOCs comprising more of the repellent components in the first 22 h of insect infestation than control plants. The speed and potency of VOC emission was increased by the CJ pre-treatment. This is the first indication that CJ can prime plants for enhanced production of defensive VOCs antagonist towards herbivores.

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Aphid threat to east potato crops as temperatures soar - Norfolk Eastern Daily Press

Aphid threat to east potato crops as temperatures soar - Norfolk Eastern Daily Press | Aphid plant interactions | Scoop.it
Aphid threat to east potato crops as temperatures soar Norfolk Eastern Daily Press While Myzus persicae (peach potato aphid) was the greatest threat for transmitting potato viruses, it presented the most difficult control challenges, said Mr...
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