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Updated: September 15, 2021
Nutrient Problems and Their Management in Tomatoes
Nutrient Problems and Their Management in Tomatoes
Updated: September 15, 2021
Manganese Toxicity in Cantaloupes
Growers may already be seeing leaf symptoms on their cantaloupe plants that are often misdiagnosed as a foliar disease. However, these leaf symptoms described below indicate manganese (Mn) toxicity which is related to low soil pH.
Updated: September 15, 2021
Maintain Pumpkin Foliage For as Long as You Can
One of the main things a grower can do to ensure a good quality pumpkin is to be sure they maintain their fungicide applications for as long as they continue to harvest fruit. Maintaining good foliage cover for your pumpkins results in pumpkin handles that are dark green stout and firm (fig. 1).
Updated: September 15, 2021
High Soluble Salts a Problem in Some High Tunnels
Over the years several high tunnel (HT) growers have complained to me about how after 4-5 years of growing various vegetables (although tomatoes were the most grown) in their high tunnel they are seeing poorer yields and ‘unthrifty plants’. This seems puzzling because they have put a great deal of compost in their HT and the soil looks great. The problem I think is high soluble salts in the soil which will damage overall plant fitness and yield.
Updated: September 15, 2021
Helping Fruit Set in Tomatoes
The high temperatures we have had this week and probably next week with daytime highs at 90oF and above and nighttime lows only getting down to 70oF in much of the mid-Atlantic may cause blossom drop and fruit abortion in tomatoes. Ordinarily in tomato fields pollination is achieved just by the action of the wind. Pollen is released from the tomato flower and falls onto the stigma.
Updated: September 15, 2021
Gummy Stem Blight in Cantaloupe
Gummy stem blight (GSB) was found in an Eastern shore muskmelon field in the last few weeks. It is a cucurbit disease caused by the fungal pathogen Didymella bryoniae. This fungus is favored by cool to warm, rainy weather. It can infect a host at any stage of growth and affects almost all parts of the plant including leaves, stems and fruits.
Updated: September 15, 2021
Frequent Heavy Rains = Lots of Vegetable Disease Problems
I do not have to tell you that these frequent and heavy rains we have been having over the last 2-3 weeks have really increased the amount of foliar and at times soil diseases in our vegetable crops. In cucurbits foliar diseases such as Alternaria, gummy stem blight and an odd one Cercospora (figs 1a, 1b) all have been found causing moderate to severe defoliation in some fields that are heavy with fruit.
Updated: September 15, 2021
Extreme Weather Events Could Compromise One of our Best Disease Management Tools in Vegetables
This article is going to be a follow-up to the one Gordon Johnson did a couple of weeks ago about how flooding and waterlogged soils can create extra challenges in our vegetable crops. An example of an extreme weather event is a downpour of 4-10 inches of rain in a matter of hours, which results in flooded fields and standing water, possibly for days.
Updated: September 15, 2021
Expect Poor Fruit Set in Tomatoes This Week
This heat wave we have had this past week will have repercussions over the next few weeks as the flowers of several crops including cucurbits, peppers and especially tomato will not pollinate or fertilize properly to develop into fruit. Daytime highs of 90o F and above and nighttime lows only getting down to 70o F in much of the midAtlantic for the last week will cause blossom drop and fruit abortion in tomatoes.
Updated: September 15, 2021
Ethylene Problems in a Few Vegetable High Tunnels
Last week Gordon Johnson had an article about exhaust problems for greenhouse transplants. In Maryland we have seen a few problems with ethylene interactions with tomatoes in high tunnels. Ethylene (C2H4) occurs in trace amounts in gasoline and natural gas and is produced when these substances are burned. It also is present in wood and tobacco smoke.
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