Olive borer borer Argedonia sp., genus Lepidoptera, moth family, wild borer subfamily.
【Host】Olive fruit tree.
【Harmful】The larvae enter the olive fruit to eat the flesh and tender core, causing the pits in the fruit to be staggered and filled with feces, causing the olive fruit to turn black and brown, fall off early, or hang on the tree. Middle-aged trees mixed with olives are particularly badly affected.
【Morphological characteristics】Adult insects Are 0.9 to 1.2 mm long, spread wings 2.35 mm wide, antennae are filamentous, the lower lip must be developed and extended forward; the forewings are light brown, silvery, with 2 wavy brown bands near the outer edge, and there is a dark brown dot in the middle of the anterior edge of the middle chamber; the abdomen has white transverse stripes; and the feet are slender. The larvae are 16 to 18 mm long, yellowish-white, with a bright red band at the anterior edge of each segment of the worm body, and a black-brown spot on the dorsal plate of the anterior thorax. Pupae are grassy green initially, turn yellowish brown later, and reddish brown before feathering.
【Living habits】There are 3 generations a year in eastern Guangdong, and the generations overlap. Overwinters as old mature larvae or pupae on the host's dead branches. The first generation of larvae begins to produce olives early in mid-to-late May, while the second and third generations of larvae are pest olives in July and September, respectively. The larvae have a habit of mothing into the center of the fruit , feeding on the more tender cores. When the core is hard, it is harmful around the core, and the fourth and fifth instar larvae increase their food intake, often leaving a layer of outer skin in the olive fruit, and the olive fruit becomes brown or black. The larvae crawl out of the fruit after the feeding has deteriorated and metastasize into pests.
【Control method】 (1) Clear the garden in winter, cut off the dead branches of the victims, especially the dead branches with a diameter of 0.6 to 0.9 cm, and destroy them intensively to reduce the source of insects. When olive fruit is found to be damaged during the fruit hanging period, the insect fruit should be removed and treated intensively in time to eliminate the larvae in the fruit. (2) Master the spray control at the initial incubation stage of larvae. Agent options: 40% octylthion emulsion, 48% chlorpyrifos emulsion 1000~ 1500 times liquid and 2.5% high-efficiency cyfcypermethrin (kung fu) emulsion 1500 ~ 2000 times liquid, etc. (3) Strengthen the investigation in mid-to-late May, spray control of the fruit-bearing green olive and black olive during the spawning and incubation period of the olive borer, and choose 40% octylthion emulsion, 48% Lesben 1200 times liquid and 2.5% high performance cypermethrin (kung fu) emulsion 1500 to 2000 times liquid. (4) Orchards that are seriously injured should harvest olive fruits early, cut off the food source of olive borer borers, and prevent further damage.