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Fruit update - June 12, 2024

Madeline Wimmer- Fruit Production Extension Educator This fruit update contains information about… Apples - Growth stage, apple maggot monitoring and management, codling moth update, and Honeycrisp leaf mottling disorder. Grapes - Growth stage and a note about when to start basal leaf removal. June-bearing strawberries - Growth stage and diseases to watch out for during rainy harvest seasons, and fruit damage from insects and insect-like pests. Minnesota Department of Agriculture IPM Fruit Update sign up form. Apples Image: Connell Red apples ranging from 3-4 cm in diameter at Northwoods Apple Orchard located in Oronoco, Minnesota (Zone 5a.) Growth stage Apples in SE Minnesota are ranging from 2.5-4.5 cm in diameter this week in SE Minnesota. Insect pests Apple maggot Image: A map of Minnesota on 06/12/2024 showing southern regions where apple maggot adults are expected to emerge in 2-3 weeks. Image retrieved from the USA National Phenology Network. The USA National Phenology Network m
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Weekly vegetable update – June 12, 2024

Authors: Marissa Schuh and Natalie Hoidal We've continued to have bouts of rain, but growers are still getting field work and planting done. Pest issues are on the rise, and we have our first few days of hotter weather on deck. General Notes Rainy weather and N deficiency The frequent and sometime heavy rains have led to nutrient deficiencies. Transplants are going in nutrient stressed in many spots after being held longer than anticipated, and rains have caused nutrient leaching. If plants are showing signs of nutrient deficiency, side dressing will be especially important this year. Quick release organic sources of N include blood meal and Chilean nitrate (check with your certifier before using this one, and be careful how you use it as it can burn roots). Nitrogen deficiency appears as uniform yellowing in leaves. Photo: Gerald Holmes, Strawberry Center, Cal Poly San Luis Obispo, Bugwood.org Deer We have seen some spots where deer have done significant damage to transplants.

Colorado Potato Beetle Refresher

Marissa Schuh , Horticulture IPM Extension Educator. Originally published June 7,2023, updated 2024. Growers are reporting seeing Colorado potato beetles and their eggs in field. We all know what these guys are capable of, let’s do a rundown of Colorado potato beetle management. The first flush of Colorado potato beetle activity is the emergence of overwintering adults, who feed and lay eggs. Photo:  Jack Rabin, Rutgers NJ Agric. Expt. Station, Bugwood.org. Non-chemical Controls Trials on Minnesota farms have found that flaming, trap crops, and trenching didn’t really work . Our old friend row covers can be helpful in protecting very small plants (assuming where you are planting isn’t full of plant debris that are housing overwintering adults).  Mulches seem to make it harder for adults to reach plants, and for larvae to bury into the soil to pupate.  Eggs can be squashed, and larvae and beetles can be removed from plants and killed in a variety of emotionally cathartic ways (soapy wa

Managing tricky vegetable pests: Cucumber beetle

Authors: Natalie Hoidal and Marissa Schuh . UMN Extension Educators. Reviewed and updated 2024. Cucumber beetles show up in Minnesota every year. This article provides a brief overview of cucumber beetles along with recommended management strategies you can use after your cucurbits are planted. Cucumber beetles: an overview Cucumber beetle, Gerald Holmes, Bugwood Striped cucumber beetles, Acalymma vittatum, are a common insect pest of cucurbits. While they are almost always present, in some years they are worse than others. Striped cucumber beetle overwinters as an adult, typically in debris or field margins near cucurbit plantings. They tend to become active in early June in the southern part of the state, and become active further north in mid to late June. As soon as cucumber beetles locate your cucurbit fields, they begin to mate and lay eggs at the base of plants. Larvae emerge underground and feed on plant roots, so they are not easy to detect until after they pupa

Early summer food safety tips for the packshed

Annalisa Hultberg, food safety educator As you are busy planting and beginning early harvests, it is a good time to think through your food safety procedures to ensure you have safe, quality product this growing season. Here is a checklist for the early season to-dos to prepare your packing and washing areas for the season. 1. Deep clean the packshed  It is a good idea to do a deep clean of your packing area and all equipment in the early season. Disassemble postharvest washing equipment as possible, scrub surfaces with soap and water, and then apply a sanitizer like a bleach solution, focusing on the areas that will touch the produce directly. Don't forget walls, ceilings, coolers, floor drains, the outside and inside of equipment, and corners and storage areas to get rid of filth from the winter.   For more information on making a sanitizing solution for surfaces,  see this webpage.  Common sanitizers are bleach or a PAA - based sanitizer like Sanidate 5.0. You can get Sanidate f

Fruit update – June 5, 2024

Madeline Wimmer-  UMN Extension Educator: Fruit Production  This fruit update contains information about… Apples - Growth stage, insect & disease management, and a note about when to remove trunk shields/protectors. Grapes - Growth stage, information about the grape cultivar Brianna, disease management, and training new vines: grow tubes. Minnesota Department of Agriculture IPM Fruit Update sign up form. Apples Image: Minneiska (SweeTango®) fruits ranging from 22-35mm at ApplesRus located in Rochester, Minnesota (Zone 5a). Growth stage Many apple fruits in the southern Minnesota regions are ranging between 20-40mm in diameter. At this stage in apple phenology—about 30 days since anthesis/bloom—fruits are finishing up cell division and transitioning into the cell expansion phase (1). Image: 1) An apple leaf with bronze-colored halo lesions indicative of either alternaria blotch (Alternaria mali) or black rot (Botryosphaeria obtusa). 2) Apple leaves showing classic apple scab (Ventur

Weekly Vegetable Update - June 5, 2024

Authors: Marissa Schuh and Natalie Hoidal Hopefully last night’s storms are the closing of the tap after another wet week. NOAA is calling for cooler than normal temperatures and less rain in the next week. Tips for dealing with flooded fields It has been wet, with more torrential rain hitting parts of that state last night. Here are some general tips for dealing with flooded fields: Don't do what I'm doing in the photo below. It's tempting to go out and inspect the damage, but it's better to wait it out until the field has drained a bit. Moving through wet fields and inspecting plants can lead to soil compaction, and you can spread disease in the process. After a heavy rain fall, wait until your crops have dried to fix any trellising or to prune out damaged plant parts. Scout your crops frequently following extreme weather events and consider spraying if you see any signs of disease to ensure that it does not spread further via wounds (e.g. wounds from hail damage, s

Cole crop caterpillars make a holey mess

Marissa Schuh, extension educator. The cooler weather we have on tap will keep our cole crops, such as cabbage, kale, and broccoli, happy.  The weather is also warm enough that insect pests will also be pleased -- including the three species of caterpillars that are starting to show up in our brassica crops. Read on to get to know these caterpillars and when it is worth managing them. Size alone isn’t enough for caterpillar ID. Diamondback moth is smooth, and tapered at each end. Imported cabbageworm is velvety. Cabbage looper and smooth and moves in an inchworm fashion. Photo: Marissa Schuh, University of Minnesota Extension. The three cole crop caterpillars we see in Minnesota are present from transplanting in May to final harvest in the fall.  The varying biology and multiple generations mean there is probably always some small green caterpillar feeding in your cole crops.  To manage them well, you need to be able to tell who is who. The first on the scene- Diamondback moth Diamondb