Xtremehorticulture

Rose Flowers Small and Wilting May Be Damage from Thrips

Q. I recently had my yard refreshed with a new irrigation system,  new plants, rose bushes and even a small tree. My roses had suffered badly the last couple of seasons. No matter what I did, the mealybugs and aphids were victorious. Even if my roses bloomed they were small and quick to wilt. I had the landscaper change the soil this time and added wood mulch to the bed. The leaves as they came in were fantastic. Gorgeous colors and so full. Then came the  first signs of the aphids. My landscaper told me to get some ladybugs in the Spring, which I did. They seemed to do the trick for a while, then, came the bites in the leaves and a return of the aphids (if not in as great abundance). Finally, before my buds even opened it looked as if they had been burned at the edges. When they opened, the black peppered the edges of the petals. imidacloprid I’m not a great gardener but I love these roses and had real hopes for them this season. A. From your description it sounds like Western flower thrips damage. They attack the petals of flowers before they open and cause browning and wilting of flower buds. You can apply Spinosad for some organic control but you will have to apply it multiple times about a week apart to get any kind of control. Orthene sprays will work to some degree as well. Another product to try is an insecticide that contains imidacloprid in the ingredients. One such product is at Viragrow and probably some nurseries as well.

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Some Scarring of Apricot Probably Not Due to Thrips

Q. I have some damage to my apricot fruits and sent you a picture. Is this damage from thrips? I have a nectarine and an apricot tree. Once all the fruit is off the tree what is the best way treat the trees? From reading your newsletters I understand thrips are hard to eliminate. At this point I would even consider a non organic method. Not all the fruit was affected, but many with a minor markings. I removed and disposed all the fruit from the nectarine tree very early as all fruit was badly damaged. Aprcot Scarring Sent from Reader A. We usually don’t associate thrips damage with apricot but we do with nectarine and damage can be heavy on nectarines if thrips are present. Thrips can also be a problem on plums and relatives of plums such as pluots and plumcots. However damage is usually fairly light and acceptable without using any sprays for plums. I will post your picture and other pictures of thrips damage on my blog located at http://xtremehorticulture.blogspot.com Nectarine damage from thrips is usually unacceptable if sprays are not used. Spray spinosad on the fruit as it is developing as soon as petals fall from the flowers in February. Follow label directions. Thirps Damage to Nectarine at The Orchard Thrips damage is not usually a problem on the leaves so spraying after harvest is not usually done. The damage to your apricot looks like it may be physical damage, in some cases, like fruit rubbing against branches. Be sure you spray during the winter with dormant oils and use soap and water (insecticidal soap) as a protective spray between regular sprays of spinosad.

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