The fact that spotted wing drosophila is being found in Maryland means that SWD is also likely to be present in warmer areas of Pennsylvania, and in the remainder of Pennsylvania shortly.
Anthracnose (also called ripe rot) in blueberry, has been quite severe this year, especially in highly susceptible varieties such as Bluecrop, Bluetta, and Blueray.
The beginning of July is a good time to start searching for the first male adults of spotted wing drosophila. Growers with late sweet cherries and sour cherries as well as blueberries and black raspberries should pay very close attention to possible movement of this pest into their plantings.
We are continuing to observe brown marmorated stink bug (BMSB) adults and nymphs in traps baited with a combination of BMSB aggregation pheromone. Now is the time to look out for the first adult male Spotted Wing Drosophilia.
Thanks to one of our growers we have been advised of a formula error in our spreadsheet.
The Tree Fruit Pathology Lab at FREC is seeking fire blight samples from around the state of Pennsylvania found in commercial orchards and home landscapes for evaluation for antibiotic-resistant strains of the bacteria and other projects.
The beginning of July usually marks a switch in our approach to control common insect pests in orchards.
Primary apple scab is finally over as of mid-June. Conditions have been ideal for canker blight: leftover fire blight cankers continue to grow and bacteria move within the tree to growing areas causing shoot blight. Conditions have been favorable lately for bacterial spot on peaches.
For a crop that may fruit for fifty years under the right care, it is critical to get blueberry plants off to a strong, healthy start.
Spotted wing drosophila (SWD), Drosophila suzukii, continues to be a problem for growers of soft-skinned fruit such as blackberry, blueberry, cherry (sweet and tart), and raspberry (black and red).
The potential for injury caused by brown marmorated stink bug adults and nymphs increased significantly during the last two weeks. It is time to start scouting for the presence of leafhoppers, especially in young orchards. Tufted apple bud moth and obliquebanded leafroller continue to be numerous in pheromone traps.
Conditions have been optimal for canker blight: leftover fire blight cankers continue to grow and bacteria move within the tree to growing areas causing shoot blight. Shoot blight is also occurring to those who experienced blossom blight, as well. Leafhoppers are active and will cause wounds in growing shoot tips, creating entry points for bacteria to enter. Pruning blighted areas and managing insects are the best methods for control.
The numbers of tufted apple bud moth and obliquebanded leafroller observed in pheromone traps in South-central Pennsylvania are similar to the numbers we observed 10 to 15 years ago, reaching over 100 moths per trap/week. Such high pest population levels require special insecticide applications targeting both leafroller species. This past week during our visual orchard monitoring we found the first eggs and nymphs of brown marmorated stink bug in commercial peach orchard. It is time to start scouting for the presence of leafhoppers, especially white apple leafhopper, potato leafhoppers and rose leafhopper.
The rainfall events experienced this season have prompted questions about the relative “rainfastness” of the insecticides used in fruit production. Precipitation can impact the performance of insecticides, but some compounds resist wash-off.
Everyone is now into their cover sprays in apples and should be applying calcium to help reduce bitter pit and corking. Cultivars prone to corking and bitter pit should receive 9 to 11 lb of actual calcium per season.
Researchers believe that long term honey bee declines are a result of a complex set of factors. The primary suspects are: poor nutrition, pesticides, pathogens/ parasites, and poor quality genetic stock. Here we will consider recent research results describing how pesticides might affect pollinators.
Up to 60 tufted apple bud moths per pheromone trap per week are being observed in orchards. Colonies of green peach aphid (on stone fruit) and spirea aphid (on stone and pome fruit) are commonly observed in fruit orchards. The presence of predators in 1 out of 5 aphid colonies may lead to successful biological control. Monitor for flagged peach tree terminals to assess efficacy of early season Oriental fruit moth treatments.
Primary scab infection is still occurring and this week will prove to be another critical period for disease management. Fire blight infections are popping up in the region and more could be expected as a result of the weather conditions. Scouting is a must this week; however, do not prune during wet weather. Conditions are also favorable for cedar apple rust, cherry leaf spot, and bacterial spot infections.
Fruit have almost completely moved out of the size range of being responsive to thinners. In looking at the fruit at Rock Springs yesterday anything small was rapidly shelling off. Fortunately, most of the fruit that was shelling off were those that had been damaged by the May 23 frost. Continue to monitor your fruit drop to see if you will need to do any follow up hand thinning. I would also suggest that you look back over the past model runs and compare the actual balances with the time you made your thinner applications.
Colonies of green peach aphid and spirea aphid are commonly observed in some orchards. Watch for predator populations such as ladybird beetles or syrphid fly larvae. The presence of predators in about one out of five aphid colonies may lead to successful biological control. As we continue to control the wide spectrum of other fruit pests, no special treatment against brown marmorated stink bug should be necessary unless nymphs are found in the orchard.