{"id":2007,"date":"2026-05-11T15:49:48","date_gmt":"2026-05-11T19:49:48","guid":{"rendered":"https:\/\/blog.uvm.edu\/fruit\/?p=2007"},"modified":"2026-05-11T15:49:48","modified_gmt":"2026-05-11T19:49:48","slug":"vt-apple-ipm-bloom-week-for-many-orchards-apple-scab-ahead","status":"publish","type":"post","link":"https:\/\/blog.uvm.edu\/fruit\/2026\/05\/11\/vt-apple-ipm-bloom-week-for-many-orchards-apple-scab-ahead\/","title":{"rendered":"VT Apple IPM- Bloom week for many orchards, apple scab ahead"},"content":{"rendered":"

This cool weather is certainly holding bud stages back from substantial development in Vermont. At the UVM horticulture research and Education Center, our zest stars are in full bloom, yet most all other varieties are at lake pink with only a few king blossoms showing. This bud stage has held for about 5 days with very slow development. Temperatures hovering around the 60\u00b0 mark should continue this slow development, and a gentle warm up this weekend and into next week should provide for good pollination conditions in orchards that are in bloom at that time. The other weather event that we are watch is an extended rain event expected Wednesday through Saturday which should Initiate a significant apple scab infection period. As we are in the accelerated phase of these primary ascospore season, all orchards should be covered with an effective contact fungicide and growers should also consider including a fungicide with good activity against rust and powdery mildew as well, Such as the FRAC group 3 and 7 materials.<\/p>\n

The good thing about this cool weather is that, for the time being, there is essentially no concern for blossom blight infections from fire blight. Extended cool weather could present issues with timing and appropriate insecticide application at petal fall, as deep bloom. May be drawn out such that there is significant time between early blooming and late blooming cultivars such that populations and damage from European apple sawfly and plum curculio could build up. To date, we have not seen nor heard of others who have singing funny European apple sawfly on monitored traps, and tarnished plant bug reports have been very low, likely due to the cool weather. Growers who wish to hang traps and report the data from them may use the farmable<\/a> app which we are trialing with help and support from the Vermont Tree Fruit Growers Association this year. If you have questions about setting the app up for reporting, please reach out.<\/p>\n

__<\/strong><\/p>\n

Terence Bradshaw<\/strong> (he\/him)<\/strong>
\nAssociate Professor, Specialty Crops<\/em><\/p>\n

Chair<\/em>, Dept of Agriculture, Landscape, and Environment<\/a>
\n(formerly Plant and Soil Science)
\nCollege of Agriculture and Life Sciences<\/a><\/p>\n

University of Vermont
\n117\/210 \u2013 Jeffords Hall | 63 Carrigan Dr
\nBurlington, VT 05405<\/p>\n

(802) 922-2591 | tbradsha
\nhttps:\/\/go.uvm.edu\/alebradshaw<\/a><\/p>\n

UVM Commercial Horticulture<\/a> | UVM Fruit Blog<\/a>
\nHorticulture Research and Education Center<\/a>
\nMessage me on Teams<\/a><\/p>\n

UVM\u2019s Our Common Ground Values:<\/a>
\nRespect | Integrity | Innovation | Openness | Justice | Responsibility<\/p>\n

\"\"<\/a><\/p>\n

UVM is subject to the Vermont Public Records Act and communications to and from this email address, including attachments, are subject to disclosure unless exempted under the Act or otherwise applicable law.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

This cool weather is certainly holding bud stages back from substantial development in Vermont. At the UVM horticulture research and Education Center, our zest stars are in full bloom, yet most all other varieties are at lake pink with only a few king blossoms showing. This bud stage has held for about 5 days with … Continue reading VT Apple IPM- Bloom week for many orchards, apple scab ahead<\/span><\/a><\/p>\n","protected":false},"author":2208,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[],"tags":[1],"class_list":["post-2007","post","type-post","status-publish","format-standard","hentry","tag-uncategorized"],"jetpack_publicize_connections":[],"featured_image_src":null,"featured_image_src_square":null,"author_info":{"display_name":"Terence Bradshaw","author_link":"https:\/\/blog.uvm.edu\/fruit\/author\/tbradsha\/"},"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p4nZlV-wn","_links":{"self":[{"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/posts\/2007","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/users\/2208"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/comments?post=2007"}],"version-history":[{"count":1,"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/posts\/2007\/revisions"}],"predecessor-version":[{"id":2009,"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/posts\/2007\/revisions\/2009"}],"wp:attachment":[{"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/media?parent=2007"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/categories?post=2007"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/tags?post=2007"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}