{"id":1989,"date":"2026-04-16T13:50:55","date_gmt":"2026-04-16T17:50:55","guid":{"rendered":"https:\/\/blog.uvm.edu\/fruit\/?p=1989"},"modified":"2026-04-16T13:50:55","modified_gmt":"2026-04-16T17:50:55","slug":"vermont-apple-ipm-green-tip","status":"publish","type":"post","link":"https:\/\/blog.uvm.edu\/fruit\/2026\/04\/16\/vermont-apple-ipm-green-tip\/","title":{"rendered":"Vermont Apple IPM: Green Tip"},"content":{"rendered":"

Warm weather has substantially advanced bud stages<\/a> on apples this week. In most of the production regions of the state, orchards are rapidly advancing through green tip and approaching or are at half-inch green. If you have any more than one \u201cmouse ear\u201d leaf showing from the developing buds, you should put the copper back on the shelf rather than risk fruit russeting.<\/p>\n

The extended rains this week have led to an apple scab infection period across the state where there is susceptible tissue showing. Ascospore maturity is expected to pick up rapidly through the weekend which places us firmly in the primary scab season for most of the orchards in the state Orchards should be protected with a contact fungicide (e.g., mancozeb, captan, copper if still at silver tip or early green tip) before wetting events. For orchards with substantial tissue open that may have had poor or no fungicide coverage during these extended wetting periods, consider adding a single site material with some kickback potential in your next spray, especially if you had a history of scab last year. FRAC group 7 or 9 fungicides<\/a> may be good options for this spray, and be sure to rotate the FRAC classes in your spray program as we move through the season. However, given the relatively low amount of tissue out there and fairly low ascospore maturity I do not suggest using kick-back materials except orchards in the warmest parts of the state.<\/p>\n

We are expecting this showery weather through the weekend so I recommend getting coverage on orchards any time there is a break in the wind. We are expecting cooler weather next week so bud stages should slow down. I won\u2019t say the f-word, but we should be keeping an eye on forecasts and keep in mind critical temperatures<\/a> for fruit bud damage. Growers may consider a Promalin application to improve fruit set in cold-damaged trees, some details on that strategy are included in this bulletin<\/a> from Amaya Atucha at University of Wisconsin. The window to treat is short, so a call to your chemical supply shop may be in order to prepare if needed.<\/p>\n

Now is a good time to think about spring herbicides.<\/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>
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UVM\u2019s Our Common Ground Values:<\/a>
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\"\"<\/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":"

Warm weather has substantially advanced bud stages on apples this week. In most of the production regions of the state, orchards are rapidly advancing through green tip and approaching or are at half-inch green. If you have any more than one \u201cmouse ear\u201d leaf showing from the developing buds, you should put the copper back … Continue reading Vermont Apple IPM: Green Tip<\/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-1989","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-w5","_links":{"self":[{"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/posts\/1989","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=1989"}],"version-history":[{"count":1,"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/posts\/1989\/revisions"}],"predecessor-version":[{"id":1991,"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/posts\/1989\/revisions\/1991"}],"wp:attachment":[{"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/media?parent=1989"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/categories?post=1989"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/tags?post=1989"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}