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Cabbage white caterpillars

By Gardeners' World on 18/10/2011 14:35:19

The caterpillars of both the small and large cabbage white butterflies are are the two culprits. The first is pale green with a body up to 2.5cm long, the second is bigger at 4cm and is yellow with black markings. The adult butterflies lay eggs


Carrot fly

By Gardeners' World on 18/10/2011 14:38:17

Creamy-yellow larvae hatch from the white eggs of the carrot fly, Psila rosae, and tunnel into the roots of carrots and other related plants, such as parsnips and celery. The damage creates brown scarring on the exterior of the taproots. Damaged


Mildew on cucurbits

By Gardeners' World on 19/10/2011 13:48:47

kill a plant. Since there are separate fungal species that affect different plants, an attack on your curcubits won't lead to a garden epidemic. Powdery mildew and powdery mildew on roses are similar problems, with similar solutions.The first sign


Whitefly

By Gardeners' World on 19/10/2011 12:38:10

Turn over a leaf and you'll see 2mm long white flies. With a life cycle of just three weeks, whitefly breed very fast. Both adults and offspring are sap feeders and a severe attack will weaken a plant. They excrete the sticky excess, called honeydew


Caterpillars

By Gardeners' World on 18/10/2011 14:39:30

Hungry, voracious caterpillars can be found in a wide variety of colours and sizes. Some feed on fruits, roots and stems, but the likes of the cabbage white butterfly, hawk moth and winter moth feed on leaves. Although they may at first seem


Cuckoo spit

By Gardeners' World on 18/10/2011 14:42:19

in distorted growth. The adult froghoppers (which don't produce any spit) are 6mm long and bright green, with large eyes and a blunt-shaped head, but they're rarely seen because they hop away on their strong back legs at the first sign of danger.Blobs of white


Bay leaf suckers

By Gardeners' World on 18/10/2011 14:33:48

insects - which have a fluffy white covering - carry on feeding on the sap, prolonging the problem. Prolific breeding in summer means the symptoms don't disappear.Young, winged, sap-feeding insects attack young bay foliage, discolouring and distorting it


Potato blight

By Gardeners' World on 19/10/2011 13:54:00

Caused by the same fungus responsible for tomato blight, potato blight causes the leaves to develop dark patches, starting at the edges. In humid conditions a white fungus appears around the marks. The infection then travels down the plant


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