Weeds in paddy

Why is it a problem? Rice is the staple diet of the Bhutanese people. Weeds are one of the constraints to rice production. In a weed survey conducted in the rice growing areas of western Bhutan, at least 19 different species were found infesting transplanted rice (Dorji et al., 2013). …

Print Friendly, PDF & Email

Lichens on apple

Crop: Apple Why is it a problem? Tree lichens are common in all apple orchards. They are only a problem if allowed to cover branches and young shoots. In severe cases they cause drying of branches and reduce growth and fruiting. This normally only occurs in poorly managed orchards and …

Print Friendly, PDF & Email

Weeds in maize

Why is it a problem? Maize is the second most important cereal crop in Bhutan. Weeds in maize are a serious constraint to increased production and accounts for about 50% of the input costs. Maize is often inter-cropped with other crops, making weed management more difficult; whether hand weeding or …

Print Friendly, PDF & Email

Weeds in potato

Why is it a problem? Potato is one of the main cash crops in Bhutan. Weeds are a severe constraint in potato production, and require considerable resources to manage. Investigations comparing three weed management treatments across a wide range of locations reported average yields of 6.7, 10.7 and 11.6 MT/ha …

Print Friendly, PDF & Email

Wild boars

Sus scrofa Crops: All crops, but especially maize, rice and potato Why is it a problem? Wild boar are the main vertebrate pests of agricultural crops in Bhutan. Crop losses due to wild boar are one of the main constraints to alleviating poverty and increasing food security in the country. …

Print Friendly, PDF & Email

Shochum

Potamogeton distinctus Crop: Rice   Why is it a problem? Potamogeton distinctus, locally called shochum, is one of the most serious weeds in transplanted rice in Bhutan. It is an aquatic plant so grows together with the rice. Yield reductions of up to 37% have been reported, even when farmers …

Print Friendly, PDF & Email

Loranthus

Parasitic plant: Scurrula parasitica Crop: Citrus   Why is it a problem? This parasitic plant can reduce growth and vigour of citrus trees. It is easily managed, and only causes serious problems in neglected orchards. Where and when is it a problem?  It occurs in all citrus growing areas from …

Print Friendly, PDF & Email

Rice sheath blight

Thanatephorus cucumeris (or Rhizoctonia solani)   Crop: Rice   Why is it a problem? This fungus can kill rice plants, or result in greatly reduced yields. Patches of dying rice can be very noticeable. However, the disease normally does not spread fast, and at present it is not a cause for …

Print Friendly, PDF & Email

Rice blast

Pyricularia oryzae   Crop: Rice   Why is it a problem? Severe epidemics of this fungus have resulted in large scale losses, including total loss by some farmers. However, it may not be as severe after widespread adoption of more resistant rice varieties following the epidemics during the 1990s. Where and …

Print Friendly, PDF & Email

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 …

Print Friendly, PDF & Email