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GARDEN PESTS AND DISEASES

N - Z

Grosafe Garden has a wide range of Insecticides and Fungicides to assist in controlling many common pests and diseases found in New Zealand gardens. Our range is certified for organic input No.4547.

Please check our Organic Spray Calendar for the optimum times to apply treatment.

Pear Leaf Blister Mite

Pear Leaf Blister Mite

Blister mites attack both foliage and fruit, producing small galls or blisters. Blisters are green or red at first but turn light brown to black as affected tissue dies. Mites do not live in the blisters on fruit, but the fruit will be scarred. Severe infestations can deform apples. Damage to pears is less serious, but scarring can make the fruit unmarketable. Severe damage to foliage can cause leaf drop and reduce shoot growth.

Treat with Grosafe Lime Sulphur

Potato Psyllids

Potato Psyllids

Tomato-potato psyllids cause injury to plants by feeding with piercing-sucking mouth parts. Both adults and nymphs cause injury. The nymphs inject a ‘salivary toxin’ into the plant while feeding. The signs and symptoms of tomato-potato psyllid include: Severe wilting, presence of honeydew secreted by nymphs, making the plants sticky and often appearing dirty, yellowing of leaf margins with upward curling of the leaves, retardation of new growth, no fruit production, or over-production of small fruit.

Treat with Grosafe EnSpray 99®

Powdery Mildew

Powdery Mildew

There are many different species of the fungal disease powdery mildew. Unlike many other fungal diseases, powdery mildew does not require moisture to infect plants. It also survives well in warmth. This means that it can infect your plants under a wide variety of conditions. Powdery mildew usually covers the upper part of the leaves and affects the older leaves first; the leaves turn yellow and dry out. If the infection is severe enough, powdery mildew can kill your plants.

Treat with Grosafe EnSpray 99®, Grosafe Lime Sulphur and/or Grosafe Free Flo Sulphur

Rose Black Spot

Rose Black Spot

Rose black spot is caused by fungus. Dark-brown to black leaf spots develop on the upper leaves, which eventually become yellow and drop. Black spot can be distinguished from other leaf spot diseases by its fringed edges and dark black colour. Raised, reddish-purple spots may also appear on rose canes. Warm, humid conditions favour its germination and growth. If left unchecked, it can cause a rose bush to totally defoliate.

Treat with Grosafe EnSpray 99®

Rust

Rust

Common rust is a fungal disease that attacks roses, hollyhocks, snapdragons, day lilies, beans, tomatoes and lawns. It is most often found on mature plants where symptoms appear primarily on the surfaces of lower leaves. Severe infestations will deform and yellow leaves and cause leaf drop. Black spores are visible on leaves and stems in fall and overwinter inside infected stems which are distinguished by dark, corky blotches at points of infection. The spores are spread by wind or by water splashing back up onto the foliage.

Treat with Grosafe Free Flo CopperGrosafe Free Flo Sulphur and/or Grosafe Lime Sulphur 

Scale

Scale

Sap-sucking pests attach themselves to the twigs, leaves, branches and fruits of host plants. Scale-damaged plants look withered and sickly. Leaves turn yellow and may drop from the plant. They may also have sticky sap or a black fungus on the leaves and stems. Heavily infested plants produce little new growth. If scale insects are not controlled, death of infested plants is possible. Scale insects are invasive and will infest other plants, so move infested plants away from healthy ones.

Treat with Grosafe Organic EnSpray 99® Insect Oil

Shothole

Shothole

Small and more-or-less rounded holes are a result of plant disease infections, especially fungal leaf spots and bacterial canker. The latter attacks members of the Prunus family – such as cherries and plums, both edible and ornamental. The disease causes the part of the leaf that is affected to turn brown and die. This dead portion then falls out of the leaf leaving behind the hole. Improving the plant’s growing conditions, will reduce stress and make the plant stronger and less likely to be attacked.

Treat with Grosafe Free Flo Copper

Thrips

 Thrips

Extremely active, thrips feed in large groups. They leap or fly away when disturbed. Host plants include onions, beans, carrots, squash and many other garden vegetables, and many flowers, especially gladioli and roses. Thrips damage plants by sucking their juices and scraping at fruits, flowers and leaves. Plant leaves may turn pale, splotchy, and silvery, then die. Injured plants are twisted, discoloured and scarred.

Treat with Grosafe Organic EnSpray 99® Insect Oil

 

Tomato Fruit Worm

Tomato Fruit Worm

The moth lays eggs on the foliage of host plants both on upper and lower surfaces. The larvae attack tomatoes just after fruit begins to set and grow, but before they ripen. They like green tomatoes! One way to find tomato fruit worms is to watch ripening If you discover one tomato that ripens considerably earlier than the others on a plant, check it for a fruit worm hole.

Treat with Grosafe Bactur® Caterpillar Killer

Verricosis

Verricosis

A fungal disease which leaves scabby marks on the skin is likely to be verrucosis or citrus scab, which can affect all citrus fruit. It looks unsightly but the quality of the fruit inside is not affected. The disease doesn’t cause major problems however, it should still be treated as it negatively affects the health and vigour of the tree, making trees more susceptible to other problems.

Treat with Grosafe Free Flo Copper

White Butterfly Caterpillar

White Butterfly Caterpillar

White butterfly is white with distinct black spots on the wings. Cabbage white butterflies target cabbages, broccoli, cauliflower and other members of the brassica family such as rocket. They lay yellow, bullet-shaped eggs on the underside of leaves. These hatch into green caterpillars that are the destructive part of the lifecycle. They start eating the outer leaves before moving to the inner heart of the cabbage.

Treat with Grosafe Bactur® Caterpillar Killer

 

Whitefly

Whitefly

Whitefly is a sap-sucking insect that is often found in thick crowds on the undersides of leaves. Both nymphs and adults damage plants by sucking the juices from new growth causing stunted growth, leaf yellowing and reduced yields. Plants become weak and susceptible to disease. Like aphids, whiteflies secrete honeydew, so leaves maybe sticky or covered with a black sooty mould. They are also responsible for transmitting several plant viruses.

Treat with Grosafe Organic EnSpray 99® Insect Oil