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BMSB Trapping Update: Flucuating Temperatures = Sporatic Trap Captures

Developing a Sustainable Model for Agricultural Research and Extension

Developing a Sustainable Model for Agricultural Research and Extension

Cool temperatures (mid to low 60’s) are predicted over the course of the next seven days. Fall temperatures have begun to drop in earnest last week, reducing movement of BMSB to pheromone traps. The mild temps today prompted the second wave of BMSB movement in flight via large aggregations to urban structures. Traps in our commercial orchard sites monitored for BMSB are quite variable, some with decreased BMSB adult trap activity with other sites seeing very high numbers over the past week. That said, our experience with this pest over the past few years has shown that the adults are likely to continue feeding on late season varieties through the end of harvest. We continue to recommend maintaining a tight program in orchards where populations of adults are or exceed 10 per week until all fruit is harvested in orchards with BMSB present.

Here are two examples of injured fruit showing older (cracked feeding sites) and newer injury with feeding tube.

Older injury with visible feeding sites

Older injury with visible feeding sites

Feeding injury beneath the skin

Feeding injury beneath the skin

Newer feeding injury expression; no visible feeding site.

Newer feeding injury expression; no visible feeding site.

Newer feeding injury with 'invisible feeding site' with undisturbed visible feeding tube.

Newer feeding injury with ‘invisible feeding site’ with undisturbed visible feeding tube.

To add insult to injury, we are also seeing varying degrees of Stippen (Calcium Deficiency) and Brooks Spot (Fungal Infection) that makes diagnostics more difficult. Images of apple damage from BMSB and ailments that appear to stink bug injury can be found here.

In previous years we have seen increasing levels of fruit feeding injury within the first 90′ from the orchard edge near woodlands through the harvest of our latest variety, ‘Pink Lady’ in mid-November.Today we observed 1% BMSB injury from a commercial block of 3000 Red Delicious fruit sampled from harvest bins and on the tree, along the orchards wooded edge. It is likely the fruit injury expression will increase once out of storage along the packing line. This time of year, as BMSB numbers increase their feeding on fruit, injury may not be observed at harvest, however, once out of storage fruit have been documented to show >15% injury on Delicious, Golden Delicious and Pink Lady.

The ‘Provisional Trap Threshold’ of 10 adults per trap per week was developed by Tracy Leskey’s team at USDA ARS-W.V. The threshold provides growers with a scientific basis for management, one that we will continue to test as an action threshold this season.

BMSB Trap Graphs 10.5.14.

BMSB Trap Graphs 10.5.14.

Since the adults will be moving in and out of orchards, scouting will need to be retained to confirm their presence in late season fruit. The insect will seek host food sources to stock up on reserves to take them through the winter while seeking and moving to urban structures and forest trees (upper canopy of dead trees with ‘flaking’ bark) as overwintering sites. Lack of substantial rainfall leading to dry conditions will likely increasing fruit injury from BMSB as the insect seeks a source for water.

Tedders trap using pheromone combination lures in peach.

Tedders trap using pheromone combination lures in peach.

Trap Capture and Scouting Threshold: Throughout the Hudson Valley there is a large disparity between orchards of both presence and abundance of BMSB. In some sites management will need to intensify until the last variety is completely harvested, while in other sites BMSB will not be found in traps in numbers that warrant control measures. In all sites scouting should also continue through the remainder of harvest.

BMSB Trap Graphs 10.5.14.

BMSB Trap Graphs 10.5.14.

Using the ‘Provisional Trap Threshold’, if BMSB adult captures exceed 10/ trap per week, or if the insect is observed on the tree, using 1 BMSB per 100 feet of perimeter orchard linear row, applications for management of BMSB should be made. Employ the first available window using one of the most effective insecticides that will best fit your harvest schedule.

The list of the most effective insecticides for BMSB management is found using this link. NYS labeled insecticides effective for use against the BMSB are available in four major classes including pre-mix formulations.

Thionex and Bifenthrin are the most effective insecticides for use against the BMSB. However, at this point in the season early blocks should be managed using Bifenthrin, Danitol and Lannate (14d PHI), with later harvested blocks employing Thionex (21d PHI). Blocks being harvested next week should use Leverage 360 (7d PHI). Boarder applications to cover most vulnerable blocks should be considered.

NYS BMSB Monitoring 9.19.14

NYS BMSB Monitoring 9.19.14

Bifenthrin received an emergency exemption use permit (Section 18) to control brown marmorated stink bug (BMSB) on apples, peaches, and nectarines in Orange, Dutchess and Ulster Counties of NY. Products include Bifenthure and Brigade, showing the greatest degree of efficacy of the pyrethroid group. However, bifenthrin has a 30d re-application interval, a 14d PHI and 12h REI. When applying either formulation of bifenthrin for BMSB control on apples, peaches, or nectarines, growers must have possession of the Section 18 label, which can be found at: 
(http://pmep.cce.cornell.edu/regulation/sec18/2014/index.html).