Rose beetles (Neosyrista? Similis), also known as rose stem bee. The main damage rose, rose, rose, ten sisters and other flowers. In addition to the larvae feeding on the stem, adult spawning can also cause the shoots to break and the affected branches to lose their ability to flower. In severe cases, more than 60% of shoots are affected.
?? Morphological characteristics? Adult body length 20-25 mm, wings 45 mm, body wings gray and black, with blue and black spots. The antennae of females are filiform, with 3 blue-blue spots juxtaposed on the back of the chest, multiple blue-black short-sloped spots on the front wings, 8 near-circular blue-blue spots on the outer edge, and 1 blue-black spot on the outer edge of the hind wings. There is a large blue-black spot in the middle of the wing and 3 tails at the end of the abdomen. The male has a slender abdomen with an oval egg, 0.9 mm long, yellow-white, and purple-black before hatching. The mature larvae are about 30 mm long, with orange-yellow heads, dark red body, hardened dorsal reticular plate, black, granular granules on each soma, white long hairs, and long, tubular, 8-21 Millimeters, auburn, with 1 pointed protrusion at head.
?? Occurrence characteristics? One generation a year, larvae in the branches of the stem overwintering. Activities began in late March of the following year, drilling out from branches and switching to new branches. Firstly, we circumnavigated between the xylem and phloem for 1 week, and then foraging for food along the pith, biting a circular defecation hole at a certain distance, and discharging oblong feces. The damaged branches and leaves were wilted and broken off. In mid-April, the eclosion was observed, and the adult eclosion occurred in early May. The females spawned in the evening, first sawing 1-3 eggs in the shoots, and the eggs were only produced in the lower part of the egg, one egg. Each female can lay over 500 eggs. The larvae can invade the shoots several times, and the larvae will overwinter in the victim's shoots after 11 months.
?? Prevention methods
1. When the shoot tip is withered, it can be cut off 2 cm below the egg mark to remove the eggs.
2. Insecticides are sprayed at the beginning of adult overwintering (caterpillar fly).
3, in the larvae damage period, can be injected into the fistula 50% dichlorvos 50 times 2-20 ml of emulsion.
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