Many growers applied chemical thinners during the week of 5/13 to 5/18, and the effects of these applications are just becoming apparent. The forecast for our region calls for temperatures in the high 80s to low 90s for Wednesday through Sunday, with lows in the mid-60s throughout that time. Under high temperatures, all thinning chemistries are more effective than when temperatures are more moderate.
Planting season winding down, but scouting becomes critical
Field and Forage Crop Team and Newsletter Contributors
Penn State Extension Water Specialist, Bryan Swistock, and Extension Educators, Jim Clark and Diane Oleson met with the Association of State Home Inspectors early in May to teach them about private water supplies.
Carbohydrate balances for the most part are positive across the state indicating the potential for trees to be less responsive to chemical thinner applications. (The exception is up along Lake Erie). IMPORTANT: Plant growth regulator label precautions supersede recommendations from thinning models when temperatures approach 90 degrees or higher.
Boxwood blight was recently detected in a landscape in Cumberland County, Pennsylvania. Boxwood blight was first detected in Pennsylvania in 2011 in Lancaster County.
The first treatment to control codling moth is needed early during the week of May 27th (around 250 DD50, 5 percent CM egg hatch on May 27th). If hand applied mating disruption materials (Isomate® or CheckMate® products) are planned for the control of CM, Oriental Fruit Moth (OFM), dogwood borer, peach tree borer and lesser peach tree borer, the dispensers should be already placed in the orchards. First generation Oriental fruit moth flight is winding down across the state. Plum curculio (PC) adults will need to be controlled for at least another week. Brown marmorated stink bug (BMSB) is continuing its movement away from overwintering shelters and feeding on multiple species of plants, most likely not inside orchards. All pheromone traps for monitoring fruit insect pests should already be placed in orchards.
Weather conditions are optimal for bacterial spot on stone fruit. Fire blight infection conditions forecasted through May 26. Bacterial spot and cherry leaf spot infection periods are also now posted.
A recently completed study of water supplies on Pennsylvania dairy farms found that about a quarter of those tested had at least one water-quality issue. And average milk production for these farms was about 10 percent lower than farms with good water quality.
Despite anticipated thundershowers with an advancing cold front later this week, most sections are likely to have an increase in their rainfall deficit by this time next week.
Here is an update to last week’s freeze damage article on barley and wheat.
Significant flights continue for the black cutworm moth, and attention should be given to the cereal leaf beetle. Meanwhile, alfalfa weevil is beginning to pupate in Southeast PA.
Not sure which adjuvant to use? Reading the herbicide label may provide some clues.
Below are tables on four sites for the Cornell Carbohydrate model for apple thinning. Please note that values for May 21 and beyond are estimated forecasts.
Too often, we tend to accept bylaws as the creation of some higher, and perhaps wiser, authority. Times change and maybe your rules of procedure should too.
Penn State’s College of Agricultural Sciences recently hosted the 2013 Pennsylvania Groundwater Symposium on May 8, 2013. The symposium was held during National Drinking Water Week in recognition of the importance of groundwater to both public and private drinking water supplies across Pennsylvania.
Shale production reports for wells producing in Ohio in 2012 were released by the Ohio Department of Natural Resources on May 17th.
Fire blight infection conditions forecasted for May 17 - 22 are high. Infection periods for apple scab, fire blight, cedar apple rust, and powdery mildew are being posted.
Below are the tables for the Cornell carbohydrate balance model from data derived from SkyBit and NEWA stations in Pennsylvania. The SkyBit stations are Wexford, Richfield and Morgantown. The NEWA stations are North East, Biglerville, Bendersville and York Springs. Remember that you should be looking at a multitude of factors when deciding on a thinning program. Following freezing temperatures at many locations on Tuesday morning, freeze damage assessment is an additional consideration. Be sure to keep good records as to when and what you apply as well as the results.