Plants - A-Z Plant Health Handbook for New Zealand

The A-Z Plant Health Handbook for New Zealand,
by Jon Muller.

3. PLANTS (listed alphabetically)

How to use this section

Plants that commonly develop problems are listed below by common name. The introduction to each plant deals with the ideal growing conditions, as it is essential to grow a plant in an environment that is as close to its ideal as possible. For example, if you grow a woodland, shade-loving plant in a hot, dry environment, it is likely to grow poorly, and be prone to pests or diseases.
The signs and symptoms for each problem are listed according to whether it is found on the leaves, stem, flowers, fruit or roots. There may be a number of likely causes. In this case, it is important for you to check the growing conditions, or recent climatic conditions, to see which cause best matches the symptoms. The solutions include cultural methods, such as removal of diseased material; alternative methods, such as using garlic sprays; and chemical methods. Some of these alternative methods have not been proven, but may be effective in dealing with the problem; for example, anecdotal evidence might support using plants to encourage predators and parasites. Chemical control refers to the use of a patented formulation with a brand name. Alternative control may include using a chemical such as Condy's crystals to control a pest or disease, which is not normally used for this purpose. Where a number of different chemicals are suggested, you can choose which one to use. Also, it is a good idea to alternate chemicals when using them, to avoid a build-up of resistance.

The full text for Camellia, Rose is reproduced here.

List of Plants and their problems covered in the A-Z Plant Health Handbook for New Zealand
Adenium Aeonium Agapanthus Weevil Wind damage Agave Akapuka Aloe Apple Apple leaf-curling midge Bitter pit Black spot Boron deficiency Codling moth Fireblight Powdery mildew Woolly aphid Apricot Brown rot Silver leaf Azalea Leaf gall fungus Leaf miner Thrips Banksia Poor drainage Bay laurel Thrips Bergenia Thrips Birds nest fern Black-eyed Susan Spider mite Boronia Collar rot Psyllid Bottlebrush Thrips Box Box blight Broadleaf Scale insect Bulbs Bulb fly Bulb mite Bulb nematode Bulb rots Cabbage tree Cabbage tree moth Nutrient deficiencies Scale insect Strong winds Sudden collapse Camellia Bud drop Flower blight Lack of nutrients Lemon tree borer Lime-induced chlorosis Virus-like symptoms Chatham Is akeake Lemon tree borer Root rot Chatham is forget-me-not Natural dieback Root rot Cherry Bacterial blast Pear & cherry slug Silver leaf Citrus Citrus brown rot Citrus red mite Frost damage Irregular watering Lack of nutrients Verrucosis Clematis Clematis rust Clematis wilt Slugs & snails Climbing rata Thrips Conifers Bag moth Cypress canker Juniper scale Leaf webbers &tiers Phytophthora wilt Thrips Coprosma Passion-vine hopper Cotoneaster Fire-blight Pear & cherry slug Crassula Currants Aphid Currant bud mite Currant clearwing Spider mite Cypress Daffodils Dahlia Earwig Katydid Oversupply of nitrogen Powdery mildew Sclerotinia Thrips Virus Daphne Lime-induced chlorosis Phytophthora wilt Virus Delphinium Aphid Powdery mildew Root knot nematode Echeveria Elm Dutch elm disease Leafhopper Lemon tree borer Ferns Dry air Frost damage Leaf nematode Low light Mealy bug Passion-vine hopper Scale insect Slugs Firethorn Fire-blight Fivefinger Armillaria Psyllid Scale insect Wind damage Flax Caterpillar Leaf spot Passion-vine hopper Scale insect Yellow leaf disease	Fuchsia Aphid Passion-vine hopper Rust Thrips Gardenia Iron/ Magnesium deficiency Geranium Caterpillar Grey mould Root knot nematode Rust Virus Gladiolus Poor flowering Thrips Golden akeake Gall midge Grape Downy mildew Eriophyid mite Grey mould Phylloxera aphid Powdery mildew Grape hyacinth Grapefruit Gum Eucalyptus tortoise beetle Gall wasps Gum emperor moth Scale insect Hakea Scale insect Heath Alkaline soil Poor drainage Heavenly bamboo Chlorosis Virus Hebe Downy mildew Gall midge Root rot Septoria leaf spot Woodiness Hibiscus Flea beetle Frost damage Hollyhock Spider mite Hosta Frost damage Snails Hyacinths Hydrangea Passion-vine hopper Scale insect Ice plant Iris Bulb nematode Virus Japanese laurel Dry, hot conditions Powdery mildew Spider mite Juniper Kaka beak Eriophyid mite Leaf miner Kalanchoe Kangaroo paw Ink spot Poor drainage Snails Kapuka Karaka Eriophyid mite Frost damage Kawakawa Chewing insect Kiwifruit Armillaria Grey mould Leaf roller caterpillar Passion-vine hopper Root-knot nematode Scale insect Kowhai Caterpillar Pysllid Lacebark Die-back Eriophyid mite Rust Lawns Black beetle Dry patch Fairy rings Fusarium Moss growth NZ grass grub Nutrient deficiency Porina Red thread Weeds Worms Lemon Leucadendron Dieback Lilies Lilly pilly psyllid Lily of the valley tree thrips Liquidamber corking Luculia Frost damage Leaf drop Root rot Magnolia Bacterial spot Dry conditions Lime-induced chlorosis Tomentum Maidenhair fern Manuka Leaf-webbing caterpillar Scale Marlborough rock daisy Poor drainage Maple Wind burn Mexican orange blossom Thrips Nectarine Brown rot Green peach aphid Leaf curl Ngaio Frost damage Oak Aphid Leaf miner Oleander Oleander knot Scale insect	Orchid Aphid Cymbidium viruses Excessive humidity Nutrient deficiency Mealy bug Poor flowering Rot Scale insect Scorching Spider mite Palm Lack of water Mealy bug Scale insect Wind damage Passionfruit Green looper caterpillar Grease spot Passion-vine hopper Poor fruit set Woodiness Peach Brown rot Green peach aphid Leaf curl Rust Silver leaf Pear Fireblight Pear and cherry slug Pear leaf blister mite Pear leaf-curling midge Photinia Fire-blight Thrips Pigface Pittosporum Psyllid Plum Aphid Bladder plum Pear & cherry slug Silver leaf Pohutukawa Psyllid Poor Knights lily Frost damage Root rot Poplar Lemon tree borer Rust Silver leaf Pride of Madeira Caterpillar Woodiness Protea Alkaline soils Poor drainage/phosphate fertilisers Puka Frost damage Puriri Eriophyid mite Frost damage Puriri moth Rangiora Lemon tree borer Magpie moth Phytophthora wilt Raspberry Dry berry Grey mould Incorrect pruning Leafhopper Passion-vine hopper Raspberry bud moth Rust Rengarenga Frost damage Leaf spot & blight Leafroller caterpillar Slugs & snails Rhododendron Lack of water Lime-induced chlorosis Magnesium deficiency Phytophthora wilt Rose Aphid Black spot Canker Downy mildew Powdery mildew Rust Scale insect Spider mite Virus Sage Green looper caterpillar Sclerotinia Satinwood Poor drainage/ excess alkalinity Scleranthus Drought stress Sclerotinia Silver beech Eriophyid mite Leaf miner Silver birch Aphid Silver leaf Strawberry tree Thrips Succulents Frost damage High nitrogen application Mealy bug Monocarpic flowering Poor drainage Scale insects Tea tree (see also manuka) Three Kings climber Frost damage Tuberose Tulips Viburnum Fire-blight Thrips Walnut Bacterial blight Eriophyid mite Waratah Alkaline soil Scale insect Wattle Psyllid Rust Waxflower Scale insect Willow Armillaria Silver leaf Willow gall sawfly Willow sawfly Wisteria Lemon tree borer Yucca Excess moisture

Excerpts

Looking after Roses & Camellias

List of plants included

Key to problems

Causes & Solutions

Guide to Chemicals
&
Alternatives to Chemicals

Introduction

Table of Contents

Links

Buy books

Acknowledgement

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Wellington Gardens Ltd: Servicing Wellington, Lower Hutt, Upper Hutt, Porirua and Kapiti
PO Box 13-402, Wellington; ph: 04 477 4744; fax: 04 477 4773; mobile: 0274 794 195
Email: info@wellingtongardens.co.nz; Web site: www.wellingtongardens.co.nz

3. PLANTS (listed alphabetically)

How to use this section

List of Plants and their problems covered in the A-Z Plant Health Handbook for New Zealand