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Updated: September 13, 2021
Seed Maggots Very Active in Our Area on Early Planted Vegetables
The unusually warm winter and early spring we have had up to now has allowed large populations of seed and root maggots to invade our vegetable fields. Some farms have been hit particularly hard in their onion, bean, pea or radish crops this season by maggots. These maggots include seedcorn maggot Delia platura (SCM), onion maggot Delia antiqua (OM) and cabbage maggot Delia radicum (CM). All three species overwinter in the soil as a maggot inside a brown pupal case (fig. 1). In March and April small, grayish-brown flies (fig. 2) emerge, which are usually SCM or CM, OM flies usually peak 2-3 weeks later. Adult flies are most active from 10 a.m. – 2 p.m. and are inactive at night, in strong winds or when temperatures are below 50o F or above 80o F. Adults live 2-4 weeks and females lay hundreds of eggs.
Updated: September 10, 2021
Flood Waters and Produce Safety
Hurricane Ida dumped a lot of rainfall in Montgomery, Frederick, and Howard Counties. If you farm in an area where local creeks or rivers overflowed their banks and flooded produce fields, your crop may have been contaminated and should be discarded. Plowing under after the soil has dried is a common method of disposal.
Updated: September 10, 2021
Clearing Up the Confusion Between GAP Audits and PSR Inspections
Developing a food safety culture is an ongoing exercise that requires reminders, reinforcement and retraining. What about regulations? What about certificate (or audit) programs? Where do each of them begin, and who needs to either comply or elect to participate? That is where the confusion often comes in.
Updated: September 2, 2021
Common Stink Bugs of the Mid-Atlantic - Hemiptera: Pentatomidae
All adult stink bugs are shield shaped. Phytophagus: Green and southern green stink bugs are light green and measure ½" to ¾" long. The green stink bug is bordered by a narrow, orange-yellow line around most of its body (Fig. 1). Brown stink bugs are dull brownish-yellow in color and about ½" long (Fig. 2). The Brown Marmorated stinkbug is a newly introduced pest to the Mid-Atlantic area and can be distinguished from other brown stink bugs by their lighter bands on the antennae and darker bands on the overlapping part at the rear of the front pair of wings (Fig 3).
Updated: September 2, 2021
Watch for Thrips and Mites in Vegetables
The hotter temperatures we have had have caused thrips and to a lesser extent two spotted spider mite, TSSM (Tetranychus urticae) populations to rapidly increase in some vegetable fields. These pests feed by puncturing the outer layer of plant tissue and sucking out the cell contents, which results in stippling, discolored flecking, or silvering of the leaf surface (fig.1).
Updated: September 1, 2021
Thrips Damage to Greenhouse and High Tunnel Vegetables Widespread and Serious This Year (2021)
Over the past few weeks we have seen several greenhouse (GH) and high tunnel (HT) vegetable (basil and tomato mostly, but also lettuce, pepper and spinach) operations from around Maryland having problems with thrips.
Updated: September 1, 2021
Stinkbug Damage Found in Tomato Fields
I have seen and have gotten reports of stinkbug damage in tomatoes over the past few days. Stinkbug feeding damage is called cloudy spot in tomato fruit (fig. 1). It occurs when the adult or immature stinkbug puts its needle- like mouth part into the fruit and removes material from a large number of cells.
Updated: September 1, 2021
Cyclamen Mites Found in Strawberries
Cyclamen mites have been found in a few mid-Atlantic strawberry fields as well as more widespread to the south of us in North Carolina. So once we start to really warm up they may become more of a problem along with two spotted spider mites.
Updated: September 1, 2021
Using Flowering Plants to Help Parasitic Wasps Attack Stink Bug Eggs
Parasitic wasps are beneficial wasps that generally lay their eggs inside the egg, immature or adult stage of another insect commonly called its host. Eggs of these wasps then hatch, leaving the larval wasp which resembles a maggot to consume the contents of the host egg.
Updated: September 1, 2021
The Stale Seedbed Technique: A Relatively Underused Alternative Weed Management Tactic for Vegetable Production
Weed management in vegetable cropping systems typically consists of crop rotation, manual weeding, weed mats, herbicides, and cultivation. Herbicide options in conventional and organically grown vegetables are limited because of infrequent registration of new herbicides and product loss due to regulatory actions. Further, vegetable crops are sensitive to many herbicides and this limits the number of products that can be safely applied.
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