Weekly Insect Bytes for August 21, 2015
Posted: August 21, 2015
Brown Marmorated Stink Bug (BMSB)
This past week the numbers of BMSB nymphs and adults collected in traps increased few folds and we observed first injured fruit. If soybean or corn are planted around orchards, the edges of the fields provide an excellent area for visual observations.
The list of effective insecticides options is limited and includes products only with few distinctive modes of action: pyrethroids (IRAC Group 3A): Bifenture (14d PHI) and Brigade (14d PHI) (only WSB formulation, Danitol (14d PHI on pome, 3d PHI on stone fruit), and Warrior (21d PHI on pome, 14d PHI on stone fruit); neonicotinoids (IRAC Group 4A): Actara (35d PHI on pome, 14d PHI on stone fruit)), Assail (7d PHI), Scorpion and Venon (3d PHI); one carbamate product (IRAC Group 1A), Lannate (14d PHI on apple, 4d PHI on peach), and some products including combinations of two different insecticide chemistries such as in Endigo (35d PHI on pome and 14d PHI on stone fruit) or Leverage (7d PHI). While trying to limit the impact of BMSB on fruit, please remember also about seasonal limits for the number of insecticide applications per season.
Commercially available BMSB traps baited with BMSB lures are very effective in detecting and capturing all mobile stages of BMSB present in orchards. For the best results BMSB traps should be placed in the orchard rows bordering possible source of migrating stink bugs such as woods, soybean or corn. As effective as the traps are in detecting migrating BMSB, they will not provide control of the bugs and should be treated only as an “early detection system”.
Codling Moth (CM)
The flight of the second and third generations of codling moth (CM) continues in most Pennsylvania pome fruit orchards. Only on site CM monitoring will provide accurate information if and for how long control treatments are necessary. Applications of Altacor® (5d PHI on pome and 10d PHI on stone fruit), Belt® (14d PHI on pome, 7d PHI on stone fruit), Delegate® (7d PHI on pome fruit, 7d PHI on plums, 1d PHI on peach and nectarines), Tourismo® (14d PHI on pome and stone fruit) Voliam Flexi® (35d PHI on pome and 14d PHI on stone fruit) or Voliam Xpress® (21d PHI on pome and 14d PHI on stone fruit) should provide excellent control of CM and OFM larvae.
The insecticides listed above as well as Intrepid ® (14 d PHI on pome, 7d PHI on stone fruit) will also provide excellent control of our two leafroller species, tufted apple bud moth and obliquebanded leafroller frequently present in orchards during this time of the season. Organically approved, codling moth granulosis virus containing products Cyd-X® and Cyd-X HP provide good control of CM neonate larvae while Madex ®HP additionally will also control OFM larvae. Both Voliam products will also provide some control/suppression of brown marmorated stink bug adults and nymphs.
Codling moth Photo: Greg Krawczyk
Oriental Fruit Moth (OFM)
The Oriental fruit moth is also active in both, pome and stone fruit orchards. Finding injured fruit and/or capture of 10 or more OFM moths per trap/week warrants specific OFM management treatment. Historically, during this time of the season, it is quite difficult to notice the exact timing for the start of consecutive OFM generations, but instead we observe continuous increases in the numbers of moths captured weekly by pheromone traps. Most insecticides effective against CM will provide also excellent control of OFM in pome fruit orchards.
Oriental fruit moth (adult) Photo: Greg Krawczyk
As the season progress and the trees become bigger, often the volume of used water per acre should be increased. Even the best insecticides will not work if the spray coverage is not sufficient. Please use the on-site monitoring as the main indicator in deciding if and when the pesticide application is necessary.
The insect pest control updates presented 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. For control recommendations, refer to the Insect and Mite Control Toolbox.