How to prevent and control persimmon? Recently, some growers who have planted oil tea have consulted this issue in the background. Here, we will briefly explain how to prevent and cure from the hazard symptoms, occurrence rules and control measures of the persimmon.
First, the symptoms of harm
The persimmon, the broad-winged wax mites, the adults, the nymphs, the oil shoots, the leaf backs, and the tender buds suck the juice, affecting the growth of the tea leaves and the photosynthesis of the leaves, causing dead branches, fallen leaves, and falling fruits. Female adults cut off the oil tea epidermis through the ovipositor to lay eggs in the branches, causing damage to the branches, and the wounds are easy to break or die; excrement easily leads to coal pollution, severely weakens the tree, affecting the yield and fruit quality of Camellia oleifera.
Second, morphological characteristics and occurrence rules
The nymph is yellowish brown, the body is white waxy, and there is waxy silk at the end of the abdomen. The newly hatched nymphs appear white wax after 8-10h, which is scattered, and the habits are good. The adult body is about 7mm long and the wingspan is about 22mm. All brown to dark brown, the front wing is wide, the outer edge has a yellow-white triangular spot near the top corner, and the rear wing is brown and translucent.
In the southern region, there are two generations a year. The second generation of adults are overwintering in litter and soil, and some are overwintering in the branches. In the first half of April, the overwintering eggs began to hatch in the first half of last year. From mid-April to mid-June, the nymphs were in full bloom, and in early June, they began to mature, and from mid-July to mid-August, they entered the spawning period, from early September to late October. Start preparing for the winter.
Third, prevention measures
1. In the winter clearing garden, the branches with egg fragments are cut off, and the broken and damaged branches are found to be removed from the garden in time and burned intensively.
2. Reduce wintering places by removing weeds, clearing litter, and turning the ground.
3. In the nymphal stage, it is possible to use the medicinal and smear-killing plants for prevention and treatment.
4. At the peak of adult occurrence, use the phototaxis of adult worms to hang black light to trap adults.
The above is all about the prevention and control of persimmons, and it is only for everyone's reference, because the varieties and climate factors are different!
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