Spotted Wing Drosophila (SWD) - Suggested Insecticides

Good morning, everyone,

As temperatures begin to cool, the risk of Spotted Wing Drosophila (SWD) infestations in your fields increases.

Below is a summary of some insecticide products, with a short PHI, listed in our guides that are specifically recommended for SWD control. When reviewing product labels, you may notice differences in label format among manufacturers, including application rates, pre-harvest intervals (PHIs), and other recommendations. This sometimes make it difficult to identify the information that applies specifically to SWD management.

For example, the same crop may have different rates or PHIs listed depending on the target pest. Always consult and follow the product label for:

•       Application rates
•       Pre-harvest intervals (PHIs).
•      Re-entry intervals (REIs).
•       Crop-specific recommendations.
•       Tank-mix compatibility
•        Spray volume requirements.
•        Surfactant recommendations.

Remember always to rotate between products to avoid resistance and if you have any questions or are unsure about any recommendation do not hesitate to reach out.

Thank you,

	Strawberry		Highbush-Blueberry		Raspberry		Blackberry
Product	PHI	# Applic.	PHI	# Applic.	PHI	# Applic.	PHI	# Applic.
Malathion 85 E	3	2	2	3	1	2	1	2
Entrust/Success	1	3	1	3	1	3	1	3
Up-Cyde	2	3	2	2	2	3	2	3
Delegate	1	3	1	3	1	3	1	3
Exirel	1	4	3	4	1	4	1	4
Harvanta	1	3	1	3	1	3	1	3

PHI: Pre-harvest Interval; Applications/season.

 

SWD males (left) have dark spots at the tip of each wing. Females (right) lack these spots but have a serrated egg-laying structure (see insert). Credit: University of Wisconsin-Madison. Div. of Extension.

Spotted Wing Drosophila Update 2026

 

Spotted wing drosophila (SWD) have been detected in the Valley and North Eastern Nova Scotia from monitoring performed by researchers and private consultants. Perennia has also been performing SWD monitoring across the province this season in berry crop fields as part of Climate Adaptation Leadership Program, with sites located in Aylesford, Sheffield Mills, Rawdon, Debert, Oxford, and Parrsborro.

SWD continues to be one of the most economically important insect pests affecting small fruit production. Unlike common vinegar flies that infest overripe or damaged fruit, SWD females possess a serrated egg-laying structure that allows them to deposit eggs into ripening, marketable fruit. This unique capability can result in rapid losses in blueberries, raspberries, strawberries, cherries, and other thin-skinned fruit crops if populations are not managed effectively.

With SWD now present, it is important to begin implementing controls when fruit is ripening up to harvest. For products available in your specific fruit crop consult Perennia’s Pest Guides or contact your commodity specialist.

Matthew Peill
Integrated Pest Management Specialist 

Neopest sampling project

Good day, everyone:

For the 2026 growing season, Perennia has funding from Nova Scotia Department of Agriculture to collect suspected neopest (Neopestalotiopsis) samples from across Nova Scotia to determine its distribution and the types/ species found in Nova Scotia. 

The perfect time to collect samples is once picking has wrapped up but prior to field renovation. But, we will keep receiving samples until the end of the season.

Please contact us if you are interested in participating in this free analysis for Nepest and arranging delivery of your samples to the Perennia Plant Health Lab.  Perennia will also be collecting samples from select farms across the province. If you are suspicious that you have a neopest infection and would like us to visit your farm, please reach out. Information on Neopest identification can be found in the attached information sheet.

For information on how you can take, preserve and ship your sample, please follow the attached sample guide.

Ship to: 173 Dr. Bernie MacDonald Dr., Bible Hill, Nova Scotia, B6L 2H5

Thanks,

Dustin and Hector

Neo-P sample collection

Sample submission Primer

Questions regarding sample collection can be sent to:

Dustin MacLean, M.Sc., P.Ag.

Plant Pathologist | Agri-Services

Perennia Food and Agriculture

Email dustinmaclean@perennia.ca

Mobile (902) 324-9623

www.perennia.ca

Plant Health Lab – Perennia

or

Hector Jaldo, Ag.Dr.; P.Ag.

Berry Specialist | Agri-Services

Perennia Food and Agriculture

Email hjaldo@perennia.ca

Mobile: 902.599.7027

www.perennia.ca

Two spotted spider mite and Cyclamen mite in strawberries

Prepared by Matt Peill (IPM) and Hector Jaldo (Berries)

Hello everyone,

Today we are highlighting two important strawberry pests that should be monitored and managed, as soon as possible, if you have not already done so. The warm, dry conditions typically experienced in July provide an ideal environment for these mites to build rapidly and cause significant crop damage.

For both pests, good spray coverage is essential. Apply miticides with a high volume of water and a non-ionic surfactant according to label instructions, to improve coverage and increase the effectiveness of applications.

Two spotted spider mites (Tetranychus urticae)

Two spotted spider mites are primarily found on the undersides of leaves, especially older leaves. Their feeding damages the leaf, reducing its ability to photosynthesis. Infested leaves may appear dull or dry on the surface, as well as have yellow or tan spotting in some cases. Damaged areas on the underside of the leaves may also appear tan and mites can be easily identified in the field using a hand lens. Two spotted spider mites are difficult to reach with spray applications, making thorough coverage critical for proper management, even with miticides that have translaminar activity (spray moves through the leaf).

Frequent rainfall this season has helped suppress populations by making it more difficult for mites to establish the protective webbing they produce. Once webbing develops, it not only shields the mites from predators but also reduces the effectiveness of miticide sprays by creating an additional barrier on the underside of leaves.

Two spotted spider mite (Tetranychus urticae). Photo: David Cappaert, Michigan State University, Bugwood.org

Overwintered female two spotted spider mite. Photo: University of Maryland extension

 

Two spotted spider mites. Photo: by Frank Peairs, Colorado State University, Bugwood.org.

Cyclamen mite (Phytonemus pallidus)

Cyclamen mites are typically found in the crown, young still-folded leaves, and within the calyx of newly developing fruit. As populations increase, they spread throughout the plant, causing leaves and fruit to become bronzed, distorted, and stunted. 

Early symptoms include deformed or crinkled new leaves. Infestations usually begin as localized hotspots but can spread quickly during harvest through worker activity and equipment. Regular scouting is important to detect infestations before they become widespread. However, cyclamen mites, due to their size, translucent appearance, and where they reside on the plant are not easily identified in the field. Additionally, many of their signs and symptoms can be caused by other physiological conditions, diseases (virus), or pests (thrips). If you suspect cyclamen mites when scouting, please have the infestation confirmed before applying miticides.  

 

Adult female cyclamen mite (yellow arrow), eggs (orange arrows) and larva (red arrow) 
Photo: UC Statewide IPM Project, 2000 Regents, Univ. California

 

Cyclamen mite damage to strawberry fruit. Photo: Ministry of Agriculture, Food and Rural Affairs Ontario Canada

Integrated Pest Management 

After your harvest and if mite populations are present, consider making one or two miticide applications while rotating between products with different modes of action. To learn what products are available for mites in strawberries, you can review the current Perennia Small Fruit PestGuide (https://perennia.knack.com/perennia-pest-management-guides#small-fruit-pest-guides/insects-and-diseases/strawberry2/). Some of the products available can be seen in Table 1.

Table 1: Some miticides for controlling Cyclamen mite. 

Rotating products helps reduce the risk of resistance development and improve long-term control. After Applying miticides continue to scout fields regularly, paying close attention to hotspots and younger plant growth where infestations often begin. If you have any questions or would like assistance identifying or managing mite infestations, please don't hesitate to contact us (email: Hector Jaldo, hjaldo@perennia.ca  and Matt Peill, mpeill@perennia.ca).

Additional Resources

https://extensionentomology.tamu.edu/wp-content/uploads/2025/03/twospotted-spider-mite-management-for-horticulture-crops-1.pdf

https://extension.umd.edu/resource/two-spotted-spider-mites-and-cyclamen-mites-found-strawberries/

https://extension.sdstate.edu/two-spotted-spider-mite-populations-reaching-threshold

https://hort.extension.wisc.edu/articles/twospotted-spider-mite-tetranychus-urticae/

https://crops.extension.iastate.edu/encyclopedia/twospotted-spider-mites

https://extension.psu.edu/twospotted-spider-mites