Clubroot

Plasmodiophora brassicae Crops: Cole crops Why is it a problem? Clubroot is a disease that deforms the roots of Cole crops preventing and distorting their development and making the plant susceptible to secondary infection. It is difficult to control, and spores can survive many years in the soil. High spore …

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Harlequin bug

Eurydema spp. Crops: Cole crops Why is it a problem? Harlequin bugs can be damaging during the seedling stage and early stage of the crops in Bhutan. Concentrated attack causes widespread withering of young leaves. However, it rarely causes economic losses. Where and when is it a problem? This pest …

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Cabbage aphid

Brevicoryne brassicae Crops: Cole crops, also mustard and radish   Why is it a problem? The wax, skins, mould and honey dew associated with cabbage aphid colonies can spoil the appearance of Cole crops for market. This is primarily a problem for broccoli where the heads can become unsaleable. Where …

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Diamondback moth

Plutella xylostella Crop: Cole crops Why is it a problem? Diamondback moth (DBM) larvae feed on the foliage of Cole crops. Although larvae are small, outbreaks can destroy entire crops if not recognized and managed in time. Larvae can be evenly distributed across a field, so can cause significant losses …

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Cabbage moth

Mamestra brassicae Crops: Cole crops Why is it a problem? Cabbage moth larvae are large and feed individually. They feed within cabbage heads, and even the presence of a few larvae within a head can completely spoil it for market. Once inside the cabbage they can be difficult to find …

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Cabbage white butterfly

Pieris brassicae Crops: Cole crops Why is it a problem? Cabbage white butterfly is probably the most important of several moth pests that feed on Cole crops in Bhutan. It is a conspicuous pest that can be managed through regular monitoring and physical control, although insecticides are often used. It …

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Common cutworm

Agrotis segetum Crop: Chilli, Cole crops, tomato, maize Why is it a problem? Larvae of the common cutworm live in the soil and cut seedlings of a range of crops. It is most important in chilli, causing poor plant stands that require replanting. Seedling losses in Cole crops are also …

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Cole crops

Cole crops are an important cash crop in Bhutan. It is grown mainly for domestic consumption. The main Cole crops grown are cabbages (3,413 MT produced in 2013), cauliflower (829 MT) and broccoli (363 MT). Cole crops are commonly grown in food gardens across Bhutan. Commercially they are mainly grown …

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Red ant

Dorylus orientalis Crop: Generalist, but can seriously impact vegetable crops including potato and Cole crops Why is it a problem? Red ants live in the soil and can feed on roots and tubers of a wide variety of plants. They make holes on the surface of potato tubers, reducing tuber …

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