Disease & Plant Health
Healthy plants have firm leaves, well-formed flowers and fruit, and well-developed root systems.
Unhealthy plants show damage to leaves, stems, roots, flowers or fruit.
REMEMBER TO LOOK UNDER THE LEAVES FOR SIGNS OF PESTS & DISEASES
A pest is an animal that damages plants.
Pests can kill plants, slow their growth and damage stems, leaves, flowers and fruit. A host is a plant on which the pest feeds. Some pests can also introduce diseases into plants.
There are two main types of plant pests: chewing and sucking.
IDENTIFYING PESTS & DISEASES IN THE GARDEN
Treatment - SPRAY WITH INSECTICIDE LIKE AQUATICUS BUGTROL (UNDER LEAVES TOO)
Most general-purpose contact insecticides containing pyrethrins will help deal with them. Make sure you spray under the leaves to catch all the leafhoppers. The adults will leap away when the spray falls near them, so repeated sprays may be needed to destroy the survivors. It is better to spray at night when less active.
With contact insecticides you'll have to ensure that all parts of the plant are covered, and several sprayings may be needed to give good control.
Spray with Insecticides on roses and ornamentals. Both kill rapidly without any leaf burn or marking.
We recommend the use of AQUATICUS GLOW as preventative treatment once the infestation is under control.
Kiwicare also offer some great natural and BioGro® certified alternatives to deal with leaf hoppers in your garden. Organic Super Spraying Oil sprayed directly on leaf hoppers and their fluffy bum juveniles will control them. Do not spray in hot sunny conditions as burning can occur.
Treatment - SPRAY WITH KIWICARE PLANT HEALTH SPECTRUM (UNDER LEAVES TOO)
If your plants already have an infestation you can squash them between your fingers but this might be difficult on more than a few buds. Use a Kiwicare PLANThealth Spectrum concentrate to spray the affected parts of the plants.
Make sure the undersides of leaves and inside curled leaves are treated.
DIRECTIONS FOR PLANT HEALTH SPECTRUM
Mix 10 ml per 1 L of clean water.
Spray foliage until run off occurs.
Spray leaves on both the upper and lower surfaces as complete coverage is required for effective control.
Apply every 10-14 days.
For a great natural and BioGro® certified alternative try Organic Super Spraying Oil to suffocate the aphids on contact but do not spray in the middle of the day as the sun can reflect onto the oil and burn the plant.
A disease is caused by bacteria, fungi, and viruses.
Diseases are caused by fungi, bacteria or viruses.
Disease prevents plants functioning properly and interferes with growth and development. It can be difficult to work out exactly what has caused a particular disease, as many plant diseases have similar signs.
Fungi are plants that cannot make their own food and rely on other plants or animals (dead or living).
Many fungi are beneficial, but some can damage or destroy the leaves, stems or roots of plants. They may attack and grow into and through the plant tissues as a mass of fine threads, feeding on plant cells as they spread.
Fungi reproduce by spores, and can spread rapidly. They prefer damp warm conditions for growth and reproduction.
Fungi are spread by:
Disease symptoms are:
mildew and mould
a furry appearance when they are mature and producing spores (this is one way of telling the difference between fungal and bacterial infections).
Fungal diseases can be prevented by:
maintaining good hygiene (disposing of infected plant material, cleaning tools)
making sure the plants in greenhouses have good ventilation and avoiding the wetting of plant leaves
using chemicals called fungicides that cover plant surfaces
using resistant plants.
What is Buxus Blight?
Buxus blight is a fungal disease caused by Cylindrocladium buxicola, affecting the Buxus species (Box). This disease doesn’t kill the roots, but it will weaken the plant. However, if you catch it early, recovery might be possible.
This disease causes leaves to brown and fall off. In addition, it can infect young stems and cause black streaks.
If the plant is infected:
Prune out the infected limbs
Sterilise your equipment between plants
Remove all leaves under the plants
Spray foliage with a fungicide called Buxus Blight Fighter
Check your plants for any signs of the fungal disease
Prune once a year as it will reduce the risk of spreading
Ensure a good airflow around your plants
Water at the base of the plant
Improve your soil’s health by adding mulch around the trees
Griselinia Root Rot Caused By Phytophthora
What is Phytophthora?
Phytophthora is a type of root rot existing in the soil. If left untreated, it can cause the decay of roots in plants. In fact, moist soil is a suitable habitat for these fungi. So, it’s vital to have good drainage for the plant. When there is too much water near the roots, Phytophthora spores will travel and can reach the plant’s roots.
It’s essential to add that phytophthora affects many other plants, not just Griselinia.
The plant may become yellow or brown when infected with root rot. They can even fall off. These symptoms can worsen if left untreated. In addition, the plant could die because it won’t be drinking water properly.
If you notice the symptoms listed above, we recommend testing the soil. If it comes back positive with the disease, you may want to consider treating the plant as soon as possible.
Remove affected plants
Replace the soil with fresh topsoil to prevent further spread
We have seen more and more Griselinia diseases this year because it has been extremely dry. The plant roots get easily damaged because it doesn’t have enough energy to absorb from the dry soil. The Phytophthora will then attack the specie.
Since this disease spreads fast, we recommend not planting this hedging shrub and looking for alternative species not susceptible to root rot, such as Buxus, Taxus, Ribes, etc.
However, if you already have Griselinia hedges around your property, we recommend doing these steps to prevent the spread or formation of the root rot:
Increase drainage of the soil
Improve the general soil’s health