Occurrence Patterns and Control Methods of the Ginger Stem Borer

The ginger stem borer (also known as the corn borer, belonging to Lepidoptera, Pyralidae) is a major pest harming ginger. It has a very diverse diet; when causing damage, the larvae bite and feed on tender stems, then bore into the stalks (with frass and insect droppings accumulating at the entry holes), blocking the transport of water and nutrients, causing the stems and leaves above the bore holes to turn yellow, wither, and droop, and making them extremely easy to break under external force.

1. Occurrence patterns. In our area, the ginger stem borer generally produces 3-4 generations per year, and the concentrated damage period coincides exactly with the vigorous growth period of ginger plants. The larvae move between plants to cause damage, and finally overwinter as mature larvae inside the host stalks.

2. Control measures. For agricultural control, strengthen field management: after harvest or before land preparation, thoroughly clean up and centrally destroy leftover materials such as borer-damaged broken plants and dead leaves; during the field growing period, after discovering damaged plants, the relevant leaves or aboveground stems can be peeled off and destroyed. The key period for chemical control is after egg hatching but before the newly hatched larvae bore into the stems. Spray the leaf surfaces with liquid formulations such as dichlorvos, malathion, kuaishaling, or decamethrin, or inject the above liquid formulations into the bore holes to seal and kill the pests.