Tag Archives: Drosophila

How Does the Asian Fruit Fly Ruin Crops? And How Do We Stop It?

There is some interesting new research out on the Asian Fruit Fly, Drosophila suzukii.

The short version: This sort of fruit fly ruins fruit crops because it prefers to, and is able to, lay its eggs on harder, firmer, unrotten, and, essentially, ripe fruit, thus ruining it. Regular fruit flies focus on rotten fruit such as groundfall.

The Asian fruit fly manages this because of slightly different fruit detection mechanisms, though some of the details of this are not yet known. In the future, it is hoped that the exact chemical used by this fly to find its target ripe fruit can be reproduced and used in the manufacture of a bait, to reduce crop damage.

The paper is:
Evolution of multiple sensory systems drives novel egg-laying behavior in the fruit pest Drosophila suzukii, Marianthi Karageorgi, Lasse B. Bräcker, Sébastien Lebreton, Caroline Minervino, Matthieu Cavey, K.P. Siju, Ilona C. Grunwald Kadow, Nicolas Gompel & Benjamin Prud’homme. Current Biology, 9 March 2017.

From the press release:

The Asian fruit fly Drosophila suzukii reached Europe and the US about a decade ago. This invasive species ravages fruit crops, including strawberries and cherries, and there is currently no effective means of staving it off. Unlike other drosophilae, which lay eggs on rotting fruits, D. suzukii chooses ripe fruits, thereby accelerating their decomposition. Researchers from the Developmental Biology Institute of Marseille (CNRS / AMU) and LMU Munich recently discovered that D. suzukii has developed greater sensitivity to the smell and taste of ripe fruit, in comparison to fermented fruit, and the ability to lay eggs in relatively firm fruit. By selectively inactivating the fly’s neurons and olfactory receptors, they demonstrated that the smell of fresh fruit enhanced D. suzukii egg laying. The scientists are now trying to identify the molecule or molecules that elicit this response. This would then make it possible to develop bait or design molecules that could inhibit egg laying. The results of their work also offer insight into how instinctive behaviors like egg laying are altered in the course of evolution.

YA Genome: Fruit Flies

I’m sure you’ ve heard, but in case not: Not one, not two, not even three, but TEN new genomes were just released, bringing the total for fruit fly genomes to twelve species.These fruit flies diverged several tens of millions of years ago, which in the large picture, is kinda recent. This will allow a useful meso-time scale comparative study across diverging genomes trapped in somewhat less divergent phenotypes.We are now starting to see patterning in the fundamental nature of selection For instance, it is now possible to begin to estimate the relative rate of genetic change at the base-pair level that is accounted for by different kinds of selective forces, such as sexual selection, selection on the immune system, and so on, and to place this in the broader context of neutral process.A good place to start reading about this is here, at Nature News.