Photo 1. Larvae or grubs of sweetpotato weevil, Cylas formicarius, damaging a vine at the crown where the stem enters the ground.
Photo 2. External damage to the base of the vine - called the crown - by the sweetpotato weevil, Cylas formicarius. Holes used by the adults to exit the stems can be seen.
Photo 3. Crown area of the vine, just above soil level, heavily infested by sweetpotato weevil, Cylas formicarius, and rots have developed.
Photo 7. sweetpotato weevil, Cylas formicarius, on the outside of a storage root left on the soil. Note the small feeding pits made by the weevil.
AUTHORS Helen Tsatsia & Grahame Jackson
Photos 1,4,5,6 & 8 Russell McCrystal, Bundaberg, Queensland.
Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat for the Pacific Community.
This mini fact sheet is a part of the app Pacific Pests and Pathogens
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