Breeding and Pest Control of Magnolia Magnolia

1. Morphological characteristics: leaf trees, about 25m high. Leaves alternate, larger, broadly Obovate to Obovate, entire. Flowers solitary, apical, white bell-shaped, fragrant. The florescence varies from November to December in Kunming, February to March in Guangzhou and March in Hangzhou. The cultivated species have numerous dwarf branches and large and dense flowers. The seedling has straight plant height, sparse branches, sparse flowers and luxuriant leaves, but it has strong adaptability and rapid growth. Propagation by sowing, grafting, striping and cutting.

Growth habits: warm and humid, shaded on the side, slightly shady, while adult trees prefer light to grow in acidic or slightly alkaline soil rich in humus and well drained. I like to be fat. Fleshy roots are not resistant to stagnant water or drought. Magnolia is sensitive to temperature, Magnolia can withstand a brief low temperature of-20 ℃.

Garden use: orchid is a famous flowering tree species in early spring, which blossoms before leaves. The flowers are fragrant, full of fragrance, fresh but not beautiful, beautiful, clean and beautiful, just like a jade tree. In classical gardens, it is often planted in front of the hall and behind the courtyard, and is named Wulan Hall and Magnolia Garden. It is interesting to plant one or two on the roadside, lawn, pavilion or inside and outside the leaky window and next to the door of the cave. Magnolia and pine tree match, under several rocks, more ancient interest Tiancheng.

Reproduction and cultivation: the species are mainly cultivated rootstocks. Grafting with purple magnolia, Huangshan magnolia as rootstock, split grafting, abdominal grafting or bud grafting and so on. Cutting can be carried out when the lateral buds of the new shoots are full at the beginning of June. Pressing is suitable for the preservation and development of famous and high-quality varieties. When the seedlings sown or grafted were re-applied with base fertilizer and controlled density, sparse buds could be seen in 3-5 years. After 2 or 3 years of planting, it entered the full flowering stage. Before planting, base fertilizer should be re-applied and properly planted deeply. Summer is the season for the growth and budding of Magnolia, and it should be irrigated during drought. Pruning can keep Magnolia trees graceful, ventilated and transparent, promote flower bud differentiation and bright flowers in the following year. Magnolia diseases include black spot, anthracnose and so on. Insect pests are large coir moth, silkworm, frost moth and so on.

II. Prevention and control of diseases and insect pests

1. Prevention and control of anthrax.

The main results are as follows: (1) strengthen the management of water and fertilizer, increase the application of organic fertilizer and enhance plant disease resistance.

(2) cut off the diseased leaves on the tree in time, clean the diseased and withered leaves on the ground, concentrate and bury them deeply, and reduce the source of infection.

(3) at the initial stage of the disease, 84.1% Dobao wettable powder and 77% Kesha wettable powder were sprayed every 15 days for a total of 2 times. Depending on the condition, spray 75% chlorothalonil wettable powder 600 × 1000 times solution and 70% anthrax Fumei 500 solution and 65% Dysen zinc wettable powder 500 times solution 50% carbendazim wettable powder + 75% chlorothalonil wettable powder 800 times solution 50% mixed sulfur suspension 500 times solution 70% methyl thiophanate ultrafine wettable powder 1500 times solution and so on.

2. Prevention and control of black spot disease:

The main results are as follows: (1) strengthen the nursery management, enhance the tree potential and improve the disease resistance. Select loose, fertile and well-drained soil, apply fully rotten cake fertilizer, loosen the soil and water in time, and pay attention to frost prevention in the north.

(2) remove the fallen leaves on the ground in time, cut off the seriously diseased leaves from the trees, and concentrate on burying them deeply.

(3) in the early stage of the disease, spraying 1purl 160 Bordeaux solution or 0.3~0.5Be stone sulfur mixture 77% can kill wettable powder, 30% king copper suspension, 25% ammonia copper solution, 50% trichlorothalonil wettable powder 600 times 800 times, 75% chlorothalonil wettable powder 800 times solution 70% methyl thiothalonil wettable powder 1000 times, etc., spray once every 10 to 15 days, 2 times in a row.

3. Control methods of Spodoptera litura:

The main results are as follows: (1) combined with field operations such as pruning in summer (first generation area) and winter and spring (1st generation area), insect cocoons are cut or broken off.

(2) cut off the leaves and kill the larvae when the young larvae are damaged by clusters.

(3) spraying 20% dimethrin suspension 20% chlorpromazine 3 suspension or spraying Bt emulsion cyanobacteria in the whole larval stage.

(4) when necessary, spray insecticides such as fenitrothion in the larval stage.