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Plantwise Technical Factsheet

cocoa weevil (Araecerus fasciculatus)

Host plants / species affected
Allium sativum (garlic)
Arachis hypogaea (groundnut)
Areca catechu (betelnut palm)
Bertholletia excelsa (Brazil nut)
Carica papaya (pawpaw)
Citrus sinensis (navel orange)
Cocos nucifera (coconut)
Coffea (coffee)
Coffea arabica (arabica coffee)
Colocasia esculenta (taro)
Dioscorea (yam)
Elaeis guineensis (African oil palm)
Helianthus annuus (sunflower)
Ipomoea batatas (sweet potato)
Ipomoea indica (blue morning glory)
Ipomoea pes-caprae (beach morning glory)
Jatropha curcas (jatropha)
Leucaena leucocephala (leucaena)
Manihot esculenta (cassava)
Melia azedarach (Chinaberry)
Musa (banana)
Myristica fragrans (nutmeg)
Persea americana (avocado)
Phaseolus (beans)
Saccharum officinarum (sugarcane)
Solanum tuberosum (potato)
Sorghum bicolor (sorghum)
stored products (dried stored products)
Theobroma cacao (cocoa)
Voandzeia subterranea (bambara groundnut)
wheat flour
Zea mays (maize)
List of symptoms/signs
Fruit  -  external feeding
Fruit  -  internal feeding
Roots  -  external feeding
Roots  -  internal feeding
Seeds  -  external feeding
Seeds  -  internal feeding
Stems  -  external feeding
Stems  -  internal feeding
The symptoms of A. fasciculatus infestation are characteristic of most internal feeders of stored commodities. The commodity may be hollowed out or tunnelled by the larvae. Adults bore circular holes when they emerge from the commodity. Adult feeding causes irregular ragged patterns of damage, particularly if feeding on a commodity previously damaged by larvae.
Prevention and control
Cultural Control

Sanitation is the most important control practice for stored product pests. This would include preventing or cleaning up any spills. Cleaning of handling or processing equipment, storage areas, etc. is very important.

Moisture content of the commodity has a significant effect on A. fasciculatus. Generally, moisture contents should be less than 12% for cocoa and coffee. Moisture contents of 8% and less usually eliminate all problems in either coffee or cocoa.

Economic Thresholds

Economic thresholds are not established for A. fasciculatus in coffee or cocoa but, due to their high value, low tolerance is expected.

Chemical Control

Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:

A. fasciculatus is of primary importance in tropical and subtropical areas of Central and South America, Africa and Asia where coffee beans or cocoa are grown. The economic impact of A. fasciculatus is particularly severe on coffee berries/beans and cocoa beans where conditions are favourable for the insect (i.e. where the commodity has a high moisture content or relative humidities are in excess of 70-80%). Properly stored coffee beans and cocoa suffer much less damage than badly stored commodities but A. fasciculatus still has an economic impact as a contaminant. A. fasciculatus can also do severe damage to stored cassava (Abrahas and Bitran, 1973; Parker and Booth, 1979).
Related treatment support
External factsheets
Pestnet Factsheets, Pestnet, English language
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