With disease control I always apply the same IPC (Identify Prevention Control or Management ) approach that I use on pest control.This leaves no margin of error and the problem can be eradicated or at least controlled.
There are over at least 100 diseases a plant gets most of them are caused by fungal infection black spot on roses, Tomato Blight,Peach leaf curl & powdery mildew.
The diseases on turf are less problematic
I will first deal with the diseases of vegetables
- The two most common ones are Brown spot
- And Blight (early Blight and Autumn)
The Good new is that it does not spread in the field or in transit meaning that it a disease to that particular plant
In this case prevention is better than cure as this disease can not be eradicated by commercial or organic fungicides
- The cause of this disease is the lack of Calcium or magnesium in the soil
- The first signs of this deficiency is the sickly anaemic look on the plant the leaves go a slight tinge of yellow and the plants rather sick.
This caused by either heavy clay soils or bad drainage where the roots can get hold of the magnesium or calcium in the soil
If this left unchecked then your plant will definitely get Blossom End Rot.
- With recent research into organic movement.Scientist now believe that to help the plant fight of disease an application of asprin will do the trick. Although this seems to far fetched. They believe that the chemical pound a salicylic acid.( Salicylic acid is a monohydroxybenzoic acid, a type of phenolic acid and a beta hydroxy acid. This colourless crystalline organic acid is widely used in organic synthesis and functions as a plant hormone. It is derived from the metabolism of salicin) found in aspirin will stimulate the plant immune system so its ready to fight back .
- Making note of the right environment for the plant is the soil too acidic ,is it in a well exposed place where it gets full days sun. or does it require a shady spot
- Pest are there aphids around – these can transmit diseases to the plant by sucking the sap
unfortunately there is no cure for blossom End Rot the plant is best disposed off
There are two types of blight that effect the tomatoes one appears in early Autumn and the other one in Late Autumn
As you can see by this picture the first tell tale signs or on the stems.
This pathogen can effect young plants too.So your best defence is spot it early
- Before it reaches the leaves and then makes it way toward the fruit . Then the plant is beyond help and best destroyed (not composted)
- In this picture you can see how it working it away up the stem to the fruit
Even when you think that your plants safe it can still effect ripening fruit and in no matter of time the fruit will become inedible.
- As you can see by this picture that the first thing it attacks is the leaves.
Should any of the leaves start looking like that its best to destroy the plant.Before it starts to infect from the rest of the crop
Since the tomato is related to the potato family its very liable to get this blight and ounce its air Bourne there is nothing you can do stop it effecting the plants
But there are cautionary measures you can take to give your plant a chance to fight it
- Hygiene I can’t amplify this enough as with Black spot this is important ;-
- If growing in pots make sure everything is cleaned and disinfected first or use new plastic pots.
- Use Grow bags compost for tomatoes not only they are ideal growing medium but there cheap too as well sterile
- As with Blossom End Rot or BER feed with a fine spray of Asprin Mix and also water into the soil
- To stop splash back and reserve water apply a mulch around the plant and pick off any fallen leaves
- Make sure that your any diseased potatoes are disposed off and the soil is clean
- Choose a resistant plant species esp if growing potatoes
- Careful watering try not to water over the leaves as this may cause the fungus spores to spread to other parts of the plant
- Management at the first sign of the seedling spray with Bordeaux mixture or there alternatives
- Environmental control this method is used here in the UK where the farmer keep an eye on the weather and as soon as the Min temperature reaches 50 degrees and the humidity is at 90 % then he will spray the crop to stop the epidemic
Unfortunately ounce the plant is infected there is no cure
- Black Spot
- IdentificationWhen you see black spot what you are really seeing are the fungal spores ie Mushrooms of the fungus known as Diplocarpon rosae.Unfortunately this fungi is resilent and very quickly becomes immune to anything so its very hard to eradicate .
As you can see from above the leaves become a yellow and black spotted hence it name
- A proper pruning and after care will minimize the risk of reinfection :-
- When pruning roses always cut away from the bud in a slope this makes sure that any fungus spores or other contaminates will run off and not go into the plant.
- Follow the three Ds system of pruning first cutting away any Dead Diseased and Dieing stems and throwing them away with the rubbish
- keep the centre clean to allow better air circulation around the plant keeping it dry (fungus thrive in wet conditions)
- In April prune to the first out pointing bud
- If the roses have any aphids then spray with insecticide for full details on which insecticide is best as they can transmit viruses and wound the plant
- Buy new roses – But don’t plant roses in the same spot as the old ones cause they wont live long. For some reason the old root system of the roses send out a chemical warning to other roses saying you are not welcome here ie a Rose transplant disease . Also dont be disappointed after a yr or two that your roses have got that blight again .Cause as I said before this is most antiviral disease it soon gets immune to anything you throw at it
- Use a fungicide esp for roses if you can use the one with a insecticide included these will at least protect the your shoots as they grow
- After pruning give them a good feed of organic matter to help them fight this fungus or give them some pelleted feed esp designed for roses as this contains traces of sulphur which help the immune system
A Few Commandments for Noob Tomato Growers (shonufforganics.com)
- Tips For Gardening In Clay Soil (fullbloomhydroponics.net)
- Tomato yellow leaf curl virus getting worse in Georgia (southeastfarmpress.com)