Have you seen mango stem miner symptoms?
Be on the lookout for these symptoms and report them to Biosecurity Queensland.
Early detection and reporting of symptoms are the key elements in controlling the pest.
Mango stem miner (Spulerina isonoma) damages new growth flushes but does not affect fruit. It is native to India, and is also known to occur in Malaysia, Thailand and the Northern Territory. In the Northern Territory it occurs from Darwin to Batchelor (about 90 km to the south). It has not been reported from other mango-growing districts of Australia.
If it arrives in Queensland, early detection of this pest will be important to ensure that it can be managed to reduce its impact on our valuable mango industry. You can help by looking for and reporting any suspicious sightings.
|Species name||Spulerina isonoma|
|Description||Larvae are white in colour with a distinctive segmented appearance (see Figure 1).|
|What to look for|
Stem blisters - dirty-white coloured blisters (20-25 mm in diameter) form at the base of new shoots. Blisters are formed by larvae feeding under the epidermis, with the epidermis becoming paper-thin over time. The layers stay affixed to the stem at the edges of the blister and mostly remain intact long after the adult has emerged.
Larvae - white, segmented
Where it attacks healthy trees in commercial growing situations, mango stem miner does not appear to adversely affect flowering and fruiting. Limited information from Thailand indicates that it does not significantly affect production.
|Hosts||Mango is the only known host, with the cultivar Kensington Pride appearing to be particularly sensitive.|
Due to the difficulty of rearing larvae from excised vegetative material, the position of mines on the oldest portion of shoots (which would not be selected for propagation), and the obvious damage caused by larvae, it is unlikely that the pest would be spread in propagating material. The relatively rapid spread throughout the rural parts of the Northern Territory suggests that it has been through the dispersal of the adult moth.