Tomato leaf miner

Tuta absoluta Crop: Tomato Why is it a threat? Although not yet detected in Bhutan, tomato leaf miner is a devastating pest of tomato in Nepal and India. Tomatoes in both open fields and greenhouses are affected. It is proving to be very difficult and costly to control. Control measures …

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Hoppers on rice

Several species of Cicadellid and Delphacid bugs Crop: Rice Why is it a problem? Leaf hoppers and plant hoppers are sap-sucking insects that at high densities can desiccate and ultimately kill rice patches of rice plants (called hopper burn). However, it rarely if ever requires management in Bhutan.  Some species …

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Rice stem-borers

Four moth species Crop: Rice   Why is it a problem? There are at least four species of stem-boring moths affecting rice in Bhutan. They kill the central shoot at the vegetative stage and can result in seed loss at later stages. Rice plants can compensate for early damage, and …

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Rice leaf folder

Cnaphalocrocis medinalis Crop: Rice Why is it a problem? The rice leaf folder attacks tillering and booting stages. High densities can reduce seed production, but this is rare and management is normally not needed. Where and when is it a problem? It is a commonly encountered pest, in part because …

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Rice caseworm

Parapoynx stagnalis Crop: Rice Why is it a problem? This leaf-feeding moth causes most damage within 2-3 weeks of transplanting. They cut off leaf tips, thereby reducing plant growth rates. Where and when is it a problem? It is more serious in poorly drained fields, but damage is rarely serious …

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Armyworm

Pseudaletia separata (or Mythimna separata)        Crops: Rice, maize, wheat and buckwheat   Why is it a problem? Armyworms can cause heavy losses to rice nurseries, with caterpillars destroying seedlings. They also attack rice and maize fields and, to a lesser extent, barley and bitter buckwheat. Although not quantified in Bhutan, …

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Asiatic citrus psyllid

Diaphorina citri Crop: Citrus Why is it a problem? The Asiatic citrus psyllid (ACP)  is the primary vector of the devastating disease, huanglongbing (HLB). Management of the vector is important to slow the spread of the disease within and between orchards. At high densities direct feeding can also damage plants, …

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Green citrus psyllid

Cacopsylla heterogena Crop: Citrus   Why is it a problem? The green citrus psyllid causes direct damage to new growth of both young and adult citrus trees. This is expected to reduce growth rates and yield. It is not known to vector the HLB pathogen although adults can acquire the …

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Fruit tree red spotted mite

Panonychus ulmi Crop: Apple Why is it a problem? Prolonged, intense infestations weaken apple trees, seriously affecting the development of shoots, buds and fruit set in the following year. Where and when is it a problem? Mites can be a pest in most apple growing regions, but serious problems are …

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Apple fruit beetles

Popillia species and Protaetia neglecta Crop: Apple Why is it a problem? The adults of six species of apple fruit beetles all feed on developing and developed apples, making them unmarketable. Although feeding damage can be conspicuous, the economic impact is not important unless beetles arrive in large numbers. They …

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