Conditions so far this season have been excellent for many stone and pome fruit diseases. Sooty blotch/flyspeck treatment threshold has been reached and disease control is encouraged. In addition to SBFS, management strategies are covered for fire blight, apple scab, fruit rots, bacterial spot, cherry leaf spot, and powdery mildew.
Brown marmorated stink bug nymphs are now present in orchards, which means a shift from “probable BMSB injuries” to actual nymphal feeding (and injuries) on fruit. From mid July until November, traps baited with commercially available, BMSB lures are very effective in detecting and capturing BMSB adults and nymphs. Green/spirea aphids, leafhoppers (potato, white apple and rose) and leafminers are the insects to watch for during the month of July.
I suppose I do not have to tell you that bacterial spot is a difficult disease to manage. Despite numerous bactericide applications, significant yield loss is not uncommon depending on the disease pressure and cultivar susceptibility. As a Master’s student in the department of Plant Pathology and Environmental Microbiology at Penn State, much of my research was focused on refining bacterial spot management. Specifically, I examined the epidemiology of bacterial spot, the defoliation associated with the disease, and age related resistance in fruit.
A toll-free hotline is available for growers in the region to receive seasonal updates about pest and pest management information. Laminated copies of the fungicide resistance management guidelines for scab, powdery mildew, brown rot, and peach scab are available for anyone who didn’t receive a copy during the spring twilight meetings this year.
This week marked the second consecutive week of increased captures of Oriental fruit moth (OFM) in pheromone traps placed both in peach and apple orchards. BMSB nymphs are present in orchards, which means a shift from “probable BMSB injuries” to actual nymphal feeding (and injuries) on fruit.
Pesticides can have benefits, but they can also have undesirable side effects. Our job in integrated pest management (IPM) is to make sure that if a pesticide is to be used, its benefits outweigh the undesirable side effects.
Cheetah™, which is the new name for a formulation of glufosinate, is now labeled for the full spectrum of tree fruit that we grow in the mid-Atlantic region. Our current warm, wet, sunny weather that favors good weed growth provides ideal conditions for application.
The primary infection period for apple scab is over. If growers are experiencing apple scab at this time, control measures will be needed throughout the remainder of the growing season to keep the disease in check. An option for fire blight management is also discussed.
First generation codling moth flight is occurring in apple and pear orchards, and moth captures in pheromone traps should serve as the main indicators if and for how long control will be needed. The next two weeks will represent the best timings for the control of tufted apple budmoth and obliquebanded leafroller. The larvae of first generation Oriental fruit moth are feeding either in growing shoots or inside developing stone fruit.
Fire blight is being reported throughout Pennsylvania and Maryland. Management strategies are discussed for dealing with active fire blight infections.
The susceptible period for fruit appears to be over. While early May showed some deficit periods in Adams County, Rock Springs experienced deficits at the end of the month. Any small fruit left on Fuji or Gala will hopefully drop in the near future.
This week we observed the first hatched eggs and instar nymphs. The presence of BMSB nymphs in the orchards means a shift from “probable BMSB injuries” to actual nymphal feeding (and injuries) on fruit and the change from “migratory” pest status of BMSB adults to “resident” pest for nymphs. The insect pest control updates presented below are for South-central Pennsylvania based on observations in Adams County. To view the insect hatch and trapping data for all major insect pests, please visit the Penn State Fruit Research and Extension Center (FREC) website, and click on "Growing Season Updates" (on the left)
Botrytis or gray mold is a major disease for strawberry growers, and there is some new information on fungicide resistance that growers should have.
Although brown marmorated stink bug (BMSB) adults still continue to emerge from their overwintering shelters, this past week we observed the first BMSB eggs deposited on fruit trees. First generation codling moth (CM) flight is underway in apple and pear orchards.
Central PA experienced a cloudless sunny weekend and the fruit grew fast. Most sites in the report show a minor deficit of carbohydrate balance which should aid in removing fruit.
Most orchard sites are calling for a surplus of carbohydrate production through the weekend as temperatures become more seasonable and sunshine is predicted across the state.
Apple thinning carbohydrate models from around the state show a negative daily balance for today and tomorrow but in general the 4 day average balance is positive.
Weather conditions affect an apple tree’s response to chemical thinners. The Cornell Carbohydrate Model is an attempt to factor in the interaction of environmental conditions and a tree’s physiological status. The model utilizes temperature, solar radiation and day length based upon site-specific ground based measurements from a weather station in a grower's orchard block.
If adult stink bugs are observed in stone fruit orchards, a special BMSB directed treatment may be warranted. If hand applied mating disruption (MD) materials (Isomate products) are planned for the control of dogwood borer and/or peach tree borer or lesser peach tree borer, now is the latest time to place dispensers in orchards.
Storms occurring on May 22, 2014 in the eastern part of Pennsylvania produced hail, which was capable of causing damage to fruit trees. Growers in affected areas will want to consider applying a streptomycin spray within 24 hrs of the hail event to protect trees from fire blight.