How to identify and control navel orange popcorns?
Popcorns, also known as rusty peel worms, occur in Navel Orange producing areas in China.
(1) Symptoms of harm The skin worms feed on the cortex of the navel orange trunk and large branches with larvae, and the rubber begins to appear in the affected area, and then the bark bursts, interrupting the formation layer, hindering the water and nutrient transmission, resulting in dead branches and dead trees.
(2) Life habits Blasters occur in 1 generation per year, with old mature larvae overwintering in xylem and underripe larvae overwintering in the cortex. Feathering begins in early April of the following year and lurks in the hole for 7-8 days before biting through the bark to get out of the hole. When the average daily temperature is about 19 ° C (mid-May), the cave begins to come out, and the end of May is the peak period for the cave out, and the hole is most often when there is no wind on a sunny day, especially after the rain, there are more caves on sunny days; There are few caves on low temperature rainy days. Within 1 day with noon out of the cave more. Adult insects mostly eat young leaves on the canopy on sunny days, and most of them lie still on the branches and leaves on rainy days, and adult insects have a suspended animation habit. Adult worms lay eggs in the branches and trunk bark cracks 1 week after they emerge from the hole, and after the larvae hatch, they moth into the bark layer, so that the bark surface is dotted with glue, and then as the larvae grow, they gradually moth inwards, straight to the formation layer, and then they feed up and down, forming irregular worm lanes, and excrete insect manure and wood chips to fill it, so that the bark and wood parts are separated, the phloem is dried, the bark bursts, and the plant dies when it is severe. Aging trees, trees with rough bark and many cracks are heavily affected.
(3) Prevention and control methods (1) Strengthen tree management. Remove moss, lichen and cracked skin from the branches to prevent the poppers from laying eggs. (2) Clear the garden in winter, remove the branches or dead branches that are seriously damaged, and burn them in a concentrated manner to eliminate the source of overwintering insects. (3) Pharmaceutical prevention and control. When the larvae hatch, apply 3x solution of 80% dichlorvos emulsion or 5x liquid of 40% Leguo emulsion to the trunk of the tree to kill the larvae under the cortex. Before the adults are nearing their peak feathering and have not yet come out of the hole, scrape off the dead cortex of the trunk, use 80% dichlorvos emulsion plus 10-20 times clay, add an appropriate amount of water to form a paste, or mix 40% Lego emulsion and kerosene in a 1:1 ratio and apply to the victim. At the peak stage of adult worms, spraying the canopy with 80% dichlorvos emulsion 2000 times liquid, or 90% crystal dichlorvos 1 000-1 500 times liquid, or 25% iminothion emulsion 500 times liquid, or 40% Leguo emulsion 1 000 times liquid, can effectively kill adult insects that have been on the tree. (4) During the incubation period of the larvae, cut the larvae with a chisel or knife at the glue flow of the tree body.
