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Peach small heartworm belongs to the lepidoptera borer fruit moth family, referred to as peach small, also known as peach borer fruit moth. Its diet is heterogeneous, and it can be the fruit of more than ten kinds of fruit trees such as peach, pear, apple, jujube, hawthorn and so on.
Harmful symptoms and habits
Peach small heartworms are mostly injected from the carcass and top of the fruit, the larvae borer fruit is the most harmful, after the larvae enter the fruit, teardrop-like pectin flows from the borer hole, and after drying, it appears as a white transparent film. With the growth of the fruit, the borer hole heals into a small black dot with a needle-sized tip, and the surrounding peel is slightly concave; after the larvae moth fruit, they dive under the skin and inside the fruit, and the fruit surface shows a shallow mark of depression, which is obviously deformed. Near-ripe fruit is damaged, generally the shape of the fruit remains unchanged, but the worm passage inside the fruit is filled with reddish-brown insect feces, resulting in the so-called "bean paste filling". After the larvae mature, they bite a circular shedding hole with a diameter of 2 to 3 mm on the fruit surface, and the reddish-brown fresh worm feces are often accumulated outside the hole.
Prevention and control methods
(1) Ground control According to the observations of larval excavation, when the overwintering larvae crawl on the ground for 1 to 2 hours before the overwintering larvae emerge and form cocoons, 5% octyl thiophosphorus emulsion 1000 times liquid can be used, and the mulch film can also be used to cover the ground and suffocate the excavated larvae.
(2) Control traps and sweet and sour solutions on trees to kill adult insects.
(3) Chemical control The appropriate period for the prevention and control of larvals is the initial egg stage of the larvae, and the spraying of 48% chlorpyrifos 1000 to 1500 times liquid has a strong tactile effect on eggs and hatching larvae; it can also be sprayed with 10% cypermethrin emulsion 1500 times liquid, or 2.5% cypermethrin emulsion 2000 to 3000 times liquid.