realenglishfruit

Top fruit tree growing advice and information from Real English Fruit

Video: Plum sawfly treatment – pheromone traps

To watch the video, scroll down and click on the thumbnail. The plum sawfly becomes active in late May and the first week of June, and it stays active right up until we pick the plums. The sawfly itself is quite an attractive flying insect, with reddish head and thorax and a yellowish abdomen, but unfortunately it lays its eggs on the plum flowers, and the young plum sawfly larvae tunnel their way into the plums as they develop. So the net result is that when you are ready to enjoy your plum, you discover that someone else has got there before you. For plum sawfly control, you can use a pheromone trap to attract the plum sawfly. The pheromone mimics the scent of the male sawfly, attracting the female and preventing her from laying her eggs on the plum tree. The plum sawfly pheromone trap show here is triangular in shape, with a sticky cardboard base containing a lure that releases the pheromone gradually. It stays active for about 6 weeks, and then you have to replace the lure. This video was filmed on 28 May, so right at the beginning of the period in which these traps should be placed. Once the sticky board is full of sawflies, just pull it out and replace it. Garden centres sell packs of replacement sticky cards and lures which makes the process cheaper. So if you install a plum sawfly pheromone trap now, and replace it in six weeks time, it will greatly reduce the damage caused to your plums.

Plum sawfly life cycle

The plum sawfly life cycle begins when the female fly lays its eggs on the plum blossom. The larvae burrow into the young plum, which reacts to the attack by exuding a sticky resin – often the only noticeable sign of the presence of the sawfly. The larva eats some of the plum from inside, and the plum may drop to the ground early, or the mature larva may crawl out and drop to the ground. In any case, when in the soil, it forms a cocoon, well disguised by soil particles. It spends the entire winter in the cocoon at a depth of about 5 cm. It pupates at plum blossom time. Another method that can be used to control the plum sawfly is to gently loosen the soil around the base of the tree in late winter and early spring, giving birds the chance to locate the pupae and eat them.

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