Early blight and Septoria are often confused, since each of these infections causes the leaves to yellow and die. And both of these infections start on the lower leaves. Check out our in-depth guides to learn more about early blight , and Septoria leaf spot. Prevention is your best bet in the battle against all of these diseases, and in some cases you can nip them in the bud or leaves, or fruit…. While these diseases are all caused by different types of microbes, there are common steps that you may employ to prevent infection.
Before you start planting, plan the layout of your garden with the help of your gardening journal. Check your seed packets to establish mature sizes of the varieties you are growing. This allows you to ensure adequate spacing between plants, to prevent the spread of disease. When choosing your plants, particularly if you know blight has been a problem in the past, choosing to grow resistant varieties is recommended. Information about resistance to different types of disease is typically included in tomato cultivar descriptions.
Keep in mind that resistance is not the same thing as immunity. Tomato plants that are resistant to early blight can sometimes contract the disease anyway. Resistance to late blight is more difficult for plant breeders to select for, since the water molds mutate quickly and have been able to overcome resistance in the past. You can read more about this variety and find out where to purchase seeds in our roundup of the best cherry tomatoes to plant in your garden. Promoting good airflow will also help to reduce the levels of moisture in the interior of the plant.
Staking your plants prevents fruit and foliage from coming in contact with the ground. Check out our guide to learn more about using the Florida weave to support tomato plants. Ideally you should test your soil before you plant, to make sure the pH is between 6.
At this time, before your seeds or transplants are in the ground, you should amend your soil accordingly. Wait until they are well established and blooming before you fertilize again. Fertilizers with an NPK ratio of or , with the highest level of phosphorus in comparison to the amounts of nitrogen and potassium, are good choices.
If you need to add nitrogen, on the basis of your soil test results, also apply calcium nitrate at the same time. This will help to avoid blossom-end rot. Do not add urea or ammonia as nitrogen fertilizers, as tomato plants are very sensitive to ammonium toxicity.
This can result in yellowing of the leaves and poor root development. Members of the nightshade family serve as hosts for all of these diseases. Such beloved crops as tomatoes, potatoes , and eggplant are all members of this family. It also includes common weeds like nightshade and jimsonweed, as well as ground cherry. All of these types of plants can harbor the pathogens, so be vigilant, and purge them from your garden! This includes volunteer tomato plants as well. Watering your plants from above can invite infection.
Fast diagnosis and a quick response are the keys to a healthy, tasty harvest. Toggle navigation GardenTech. Find a Product. Identify Your Pest. About Us. Contact Us. Identifying Blight. Types of Blight Early Blight. Preventing Blight. Practice crop rotation by planting tomatoes in a section of the garden that has not been used to grow tomatoes or any other member of the Solanaceae family, such as eggplant, potatoes or peppers, in the last two years.
Facebook Twitter. Feedback, questions or accessibility issues: info extension. Skip to content Search for:. Early blight of tomato. Note spots with concentric rings arrow and yellow haloes.
Download Article. To rake or not to rake? Plant Bulbs Now for Spring Color. Explore Extension ». County Offices. Staff Directory. There is also an extensive list of resistant cultivars on Cornell University's vegetable pathology website. Resistant varieties are not immune to early blight. Rather moderate levels of resistance to either leaf infection, stem infection or both are present. Below is a partial list of fungicides available for control of early blight on tomato.
Applications should be made when environmental conditions favor disease to be the most effective and repeated according to label instructions. It is important to alternate between different chemical families to avoid the development of pathogen insensitivity to particular active ingredients.
Some insensitivity to the chemical family 11 has become more common in some areas, so particular care should be taken to rotate these with other chemical families.
0コメント