What Is Prickly Ash Bark?

Guizhou Zanthoxylum (scientific name: Zanthoxylum esquirolii Levl.) Is a deciduous tree belonging to the family Rutaceae and Zanthoxylum, with a height of 15 meters. The leaves have leaflets; neatly opposite, narrowly lanceolate or near-ovate at the base of the leaf axis, tapering at the top and tapering at the base, rounded at the base, with obvious cracks at the edge of the leaf, many oil spots, visible to the naked eye, the back of the leaf is gray-green or has Off-white powder frost, inflorescence terminal, many flowers, pale yellow-white petals, pale reddish-brown petals, flowering from August to September, and fruiting from October to December.

Guizhou pepper

(Zanthoxylum deciduous tree)

Zanthoxylum tree is resistant to drought and barrenness, and is especially suitable for planting in terraced fields, marginal fields, wasteland, orchards. Scientifically planting pepper tree also improves the ecological environment ^[2]

Guizhou, Sichuan, Yunnan. Found in mountain sparse forests or bushes at an altitude of 900-2000 meters. The type specimen was collected from Guizhou, and the location is unknown (probably the suburb of Guiyang).

Habits: Zanthoxylum bungeanum occurs every generation in Weibei. Overwintering with 2nd instar nymphs with white cocoons on bud bases, stings and branches. Cocoon: oval, 2-3mm long. From late February to early March, the cocoon blooming season is in full swing. The newly emerged nymphs are harmful to the group nest at the base of the buds. When the buds gradually grow and the first leaves connate, the nymphs will gradually spread to the tops of the buds and the back of the young leaves to feed, causing the leaves and buds to distort, causing flower and fruit drop. , Causing the shoots to wither or even die. Females emerged in late April, and males and females usually mate at 4-5 pm on a sunny afternoon. Males have multiple mating habits. The female lays oocysts and lays eggs on the back of the leaf. An adult lays more than 300 eggs, usually about 140. Nymphs hatched in large numbers in the first half of May, and gathered in the shape of leaves to harm the back. It peeled for the first time in early July, and began to migrate to the base of buds and branches in early mid-October, and cocooned overwintering in early November. The worm is mainly transmitted by wind.
Control technology 1. Chemical control:
(1) Prevention of cocoon nymphs: from late February to mid-April, using 1000 times speed Pu Xijia 2% washing powder or 600 times more Noble, 1200 times the power to kill the tree spray, can play a good kill Insect effect.
(2) 800-1000 times of hydrazine or 1000 times of fendicarb plus 1/2 "auxiliary" (or special effect king) foliar spray at the egg stage.
(3) The nymphal period is from late June to mid to late October. Select 600 times dying net plus 1000 times permethrin plus 1/2 "auxiliary" or 1000 times imidacloprid plus 800 times dichlorvos plus 1/2 " Additives "control.
(4) Overwintering period can be used to kill chigger mites (biological pesticides) or 3-5 degrees stone sulfur mixture for tree spraying to eliminate nymphs.
(5) For plots lacking water or inconvenient transportation, chlorpyrifos, golden retriever fertilizer, auxiliaries, and water can be mixed into a mixture of 1: 1: 0.5: 5 in the nymph cocoon period, and the ring width 3- 5cm can play an early role in controlling the damage of nymphs and pepper aphids.
2 Agricultural measures:
(1) When the density of insects in the spring is too large, the insects can be knocked to the ground by artificial tapping, and then combined with spring ploughing and raking, the female nymphs can be eliminated.
(2) The egg sac can be artificially removed during the egg stage, which can kill a large number of eggs and nymphs and effectively reduce the worm population.
3. Issues that should be paid attention to during control:
(1) The worm body of Zanthoxylum bungeanum is small and spreads by wind. Therefore, it is necessary to pay attention to the investigation of the previous insects, carry out detailed inspections, strengthen joint defense and cooperative defense, adhere to the prevention and control, and adhere to the group prevention and group treatment.
(2) The harmful part of the insect is hidden, so it must be careful and thoughtful when spraying.
(3) Use more pollution-free, low-residue pesticides. It is strictly forbidden or restricted to use highly toxic and high-residue pesticides. Strictly operate according to the concentration of pesticides. Stop using the medicine 20 days before harvest. ^[3]