Chinese fruit fly

Bactrocera minax Crop: Citrus Why is it a problem? Chinese fruit fly is the most serious insect pest of citrus. UP to 70% losses through late fruit drop have been reported. It remains difficult to manage. Where and when is it a problem? It is most important in orchards above …

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Citrus trunk borer

Anoplophora nr versteegi Crop: Citrus Why is it a problem? Stem-boring larvae can cause tree decline, mostly by ring-barking of younger trees. Pest populations are slow to build up and are relatively easily managed. Pesticides are not needed. Where and when is it a problem? The beetle is present in …

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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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Grain moth

Sitotroga cerealella Crop: Stored grain, especially maize Why is it a problem? The grain moth is an important pest of whole cereal grains, especially maize. It destroys the inside of grains, resulting in weight loss. Where and when is it a problem? Grains moths are less widespread than grain weevils. …

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Grain weevils

Sitophilus species Crop: Stored grain, especially maize Why is it a problem? Grain weevils are the most important stored grain (post-harvest) pests in Bhutan. The attack whole grains, especially of maize. Where and when is it a problem? They can cause high losses below about 1,200 m asl, intermediate losses …

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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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