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Updated: September 15, 2021
Does it Pay to Graft Tomatoes for Increased Yields When There are No Soil Disease Problems
Tomatoes are grafted by joining the top part of one plant (the scion) to the root system of another plant (the rootstock) (fig. 1). The resulting plant is usually more vigorous and productive.
Updated: September 15, 2021
Cold Damage to High Tunnel and Greenhouse Vegetables
Last week Gordon Johnson had an article talking about cold damage to peas and there also has been some cold damage and weather induced damage to vegetables in high tunnels and greenhouses.
Updated: September 15, 2021
Celery Leaf Curl Found in Several Fields in the Mid-Atlantic
We don’t see many samples of celery in the lab or are called out to look at problems with it, but in the past 2 weeks we have seen several samples of a potentially yield reducing problem in celery that is becoming more widespread. The disease is called celery leaf curl, or celery anthracnose.
Updated: September 15, 2021
Catfacing Problems in Tomato
There have been some reports from growers and educators of several sets of tomato fruit with catfacing or that are deformed (Fig. 1). Catfacing results in fruit with deep indentations in the blossom end or fruit with significant distortions. It is thought to be caused by a problem during the formation of the flower that results in the fruit not developing normally. However, there is little information as to its exact cause. At times the first set of tomatoes in fields looked good, but the second, third and in some cases 4th sets are having problems in some fields. The problem is most probably due to the cool night temperatures we had 20-30 days ago in some areas.
Updated: September 15, 2021
Blossom End Rot in Tomatoes
This is just a reminder with the peculiar weather we have had lately with stretches of very high temperatures then cooler days and throw in the very heavy down pours we have had over the last few weeks, blossom end rot can become a real problem in tomatoes.
Updated: September 15, 2021
Black Dot Root Rot - Seldom Seen Tomato Disease Found in High Tunnel
A root disease that is most commonly associated with potato has turned up on tomato in a high tunnel last week. This disease goes by the delightful name of black dot root rot. The causal agent is Colletotrichum coccodes, which also causes anthracnose fruit rot on tomato (sunken, water-soaked, circular lesions).
Updated: September 15, 2021
Be Alert For Late Blight Showing Up On Tomatoes
Another disease we might be seeing now and in the next week or so is late blight. The weather conditions of the past week have been favorable for its development: cool (for summer temperatures) daytime and nighttime temperatures along with ample moisture.
Updated: September 15, 2021
Air Pollution and its Effect on Vegetables
Air Pollution and its Effect on Vegetables
Updated: September 15, 2021
Yellowing of Cantaloupe Leaf Edges
I have been seeing and receiving a few samples of yellowing (chlorosis) around the margins of cantaloupe leaves (Fig. 1). The marginal chlorosis observed in figure one would indicate salt burn, which is a noninfectious problem that mostly affects cantaloupes. This yellowing at the leaf margin is likely the result of guttation, which is how plants exude water at the margin of the leaf.
Updated: September 15, 2021
Sulfur Deficiency in Sweet Corn
I have seen several sweet corn fields lately that have sulfur deficiencies (fig 1). One of the possible reasons we are seeing more S deficiency is because less sulfur is being deposited into the soil from the atmosphere due to reductions in acid rain. In 1986 about 24 lbs/a of sulfate were deposited in Maryland soils per year, however in 2011 it was closer to just 8 lbs/a each year. Organic matter supplies most of the sulfur to the crop, but sulfur must be mineralized to sulfate-S to be taken up by crop plants.
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