Understanding Physiological Diseases in Plants - Blossom End Rot in Tomatoes.

Sat, 30 Jun 2018 09:12:29 +0530

Physiological Disorders in Plants

Pest and disease are the two words we get acquainted with during gardening. There is another important word we need to be aware of, and that is 'Physiological Disorder.'

Some common physiological disorders are particular to crops. Ex. Blossom End Rot in tomato, tip burn in lettuce, the bitter pit of the apple, whiptail in cauliflower, and many others.

Adjoining image shows tip burn in romaine lettuce.

In today's article, we will cover a critical but common physiological disorder, Blossom End Rot, a.k.a B.E.R, which commonly impacts tomatoes and bell peppers.

Understanding B.E.R.

To understand B.E.R., we need to split this disorder's name to get its meaning - Blossom (=Flower; later develops into fruit) - End (=basal region) - Rot. A dark color spot at the blossom end of the fruit represents Blossom End Rot. Though also found in Capsicum, It's the most common physiological disorder of tomato. It is a disorder that you will notice in your garden if your tomato plants are deficit in calcium, a secondary macronutrient. Other crops that get affected by B.E.R. are Chilli, Brinjal, Watermelon, and Squashes. Blossom End Rot occurs when there is a wide fluctuation in water management as the calcium uptake and movement activity reduce in plants.

What causes BER?

Though in a vast majority of cases, calcium deficiency is the culprit, still, in a few instances, BER may occur due to other causes, like:

Supply of higher concentration of nitrogenous fertilizers
Higher salt levels in growing media
Damage to roots while doing any operations in the garden
pH (too high or too low) can also be a reason

Is Calcium the culprit?

Contrary to popular belief, calcium deficiency may not be the reason behind blossom end rot in your plants.

Blossom End Rot Progression

It starts with a small, depressed and water-soaked lesions (air spaces under the epidermis tissue of fruit become filled with liquid) on the blossom end of the fruit. There will be water-soaked spots. As the fruit develops, the size of the spot will increase, giving a black/brown, patchy appearance on the fruit that eventually rots and becomes unfit for consumption.

BER Start

BER Progression

Is blossom end rot a serious problem?

It May not be, when you lose 5-10 fruits from a big lot. But you must be cautious when you grow fewer plants in the garden. Moreover, if the severity of the disorder is less, you can trim off the affected part, and the rest of the vegetables can be consumed.

How to manage blossom end rot?

To solve for Calcium deficiency, you can increase the amount of calcium in the nutrient plan of your crop. Apart from solving for Calcium deficiency, you can follow the following measures to mitigate the chances of developing Blossom End Rot in your plants.

Do water the plants at regular intervals.
Maintain a neutral pH in the medium.
Use nitrate nitrogen, instead of ammoniacal nitrogen.
Do not damage the roots, while doing intercultural operations (hoeing)

Kindly check for the BER in your garden if you are growing tomatoes. Do not spray insecticides/fungicides thinking it's a disease. Be aware of this physiological disorder.

Happy Gardening!

CityGreens Hydroponics - Blog #Diseases