You nurture your tomato plants until you have beautiful fruit maturing on the vine.Upon closer inspection, you discover that somet
06.06.2023 - 16:28 / gardenerspath.com / Helga George
How to Identify and Prevent Crown Gall on Apple Rhizobium rhizogenesDoes your apple tree have weird growths on it? Apples are prone to several different kinds of galls, but crown gall is the worst of them.
This disease, caused by the bacteria Rhizobium rhizogenes (old name Agrobacterium tumefaciens), is likely to be fatal to your tree over time.
Since crown gall can infect hundreds of kinds of plants, a number of fruit trees can contract this infection. They include apple, crabapple, peach, nectarine, plum, apricot, cherry, and pear.
We link to vendors to help you find relevant products. If you buy from one of our links, we may earn a commission.
The bacteria genetically engineers plants to use their own DNA to make tumors. What you see as the gall is actually a tumor that your tree has grown.
How to Tell if Your Tree Has Crown GallIf your tree looks like it has warts, it is probably crown gall. The galls start out light in color but turn dark over time.
The growths vary in size – typically pea-sized to several inches – but they can grow to as much as a foot in diameter.
Most of them will be at or just below the soil line, but some could be on the upper stems.
Since the galls are caused by the production of hormones, which can travel through the plant, these growths can be some distance from the actual infection.
Sometimes people get crown gall confused with growths caused by woolly apple aphids or with burrs (aka burl). The woolly apple aphid galls appear in a greater number in an infected tree and they are smaller.
And more importantly, the aphid variety produces a white cottony wax.
Effects of an InfectionCrown gall interferes with the flow of nutrients and water up the stem. This can affect normal growth, and your tree might
You nurture your tomato plants until you have beautiful fruit maturing on the vine.Upon closer inspection, you discover that somet
Late blight is a serious disease that may affect tomatoes and potatoes. It can rapidly destroy entire fields and ruin a farmer’s income for the year. And it may affect crops in home gardens severely as well.You may not realize it, but you are probably already familiar with the
Hydrangeas can be lush, carefree plants, but they are also vulnerable to a number of different fungal infections that can sully the leaves – and in some cases, the flowers.You know that old saying, “There’s a fungus among us?” There is some truth to t
The squash bug is a pernicious insect, one of the most common and serious pests of cucurbit plants like squash and pumpkins, as well as cucumbers and melons, though typically to a lesser degree.Unfortunately, these bugs are widespread throughou
Peace lilies, Spathiphyllum spp. are easygoing houseplants that seldom suffer from disease issues when provided with the right care.In fact, they are so easy to grow that Dr. Leo
Walnuts have entranced societies for thousands of years with their beauty and shade – not to mention their delectable and extremely healthy nuts and valuable wood.However, there is a dark side to growing walnuts, and it comes
Bot rot, also known as white rot, is caused by the fungus Botryosphaeria dothidea. Infection can result in a complex of diseases – two types of fruit rot and cankers on the limbs and twigs.This pathogen infects not only apples and crabapples but also a number
As a child growing up in Delaware, I was always fascinated by agapanthus, a plant I was only familiar with from ogling books filled with pretty pictures of different flowers.I still vividly remember my excitement on m
Viburnum is a genus of over 150 species of deciduous and evergreen perennials that feature showy flowers and attractive foliage, many of which are native to North America.Most species are woody shrubs, though some have
If your tomato plants have enormous flower buds and little or no fruit develops, you should examine them more closely to see if they have the aptly named tomato big bud disease.While this disease can be a severe problem in subtrop
Cabbage maggots are small insects that can have a huge impact on cole crops, such as cabbage, broccoli, turnips, rutabaga, radishes, cauliflower, and brussels sprouts.The larvae live in the soil, feed on the fibrous roots
You think you’ve got it made with your pecan trees, Carya illinoensis, and have visions of pies (at the least) or even some sales at the farmers market when all of a sudden – the husks start turning black.There are several things that can cause this, and one of the most