Seedling disease
Powdery mildew occurs in the crape myrtle, Euonymus japonicus, rose more, can be used 50% carbendazim 300-400 times solution or 50% thiophanate 800 times liquid control, generally twice, interval 7-10 days spray once.
Leaf spot disease may occur in many seedlings such as Euonymus japonicus, Chinese rose, Jellyfish seedlings, red leaf plum, Japanese cherry tree, and gold leaf privet, and 50% thiophanate-methyl 800-fold or 1:1:100-fold Bordeaux mixture may be used. Control, spray two or three times in succession, interval 7-10 days.
Others For the transplanted shoots that have just been transplanted this spring, two to three sprayings should be carried out, mainly using carbendazim, thiophanate or baijinqing.
Seedling pests
Scale insects such as these pests are more difficult to control if they do not seize the opportunity, local occurrence in the Camellia, cedar, cheekbones, wax plum, smiling, crape myrtle, sweet-scented osmanthus, Chinese rose and other seedlings, usually in the winter or early spring before germination with 3-5 Baume degree of lime sulfur or seize nymphs incubating period with 50% killing pine 800 times plus a small amount of detergent spray misting effect is better.
Other spider mites often occur on cypress trees and can be controlled by acaricidal drugs. Insect pests mainly occur locally on seedlings such as willow, poplar, sedum davidianus, red-leaved plum, eucalyptus linden, and huangshan eucalyptus, and can be used to trap larvae. Aphids mainly occur in seedlings of Pittosporum tobira, Camellia sinensis, and Hongyeli, and infestation of bag moths and moths may occur on many seedlings and should be controlled during larval stages.
In short, pest control is one of the most important tasks in the management of seedlings in summer, and has a great influence on the growth of seedlings. In particular, seedlings transplanted with large seedlings, such as the second successive new leaf beetle, will die, so they should be checked frequently. Timely prevention and treatment.
Sunburn and frost
Newly planted seedlings or seedlings in the field in this year are generally best shaded in summer. If there is no condition, weeding should be done to prevent weeding of seedlings with high temperature and high humidity. The most common cause is leaf withering and near-ground seedlings. Dry atrophy, but for the pine seedlings should not be shaded, shade instead of poor growth.
For seedlings that are prone to freezing injury in winter, nitrogen fertilizers, controlled irrigation, and application of phosphorus and potassium fertilizers should generally be stopped in summer and autumn to promote adequate lignification of seedlings. Seedlings that are prone to frost damage include: Drunk scented smile, Shan Duying, Tianzhu Gui, Zhejiang Nan, Zupuzi, Chongyangmu.
Irrigation and drainage
Irrigation and drainage are also an important part of the management of nursery stocks in summer. For the nursery, it is necessary to be able to fill irrigation, especially seedlings planted or transplanted that year should pay more attention to doing this work. Most of the seedlings are best fed with water for 10 days in the summer when there is little rain and drought. The best time is to do it sooner or later. For the ginkgo and pine seedlings, the drought resistance is strong. Generally, no irrigation is needed, and the number of seedlings for poplar, weeping willow, and metasequoia may be increased. Appropriately increase. For seedlings to be drained, there must be no accumulation of water in the seedlings after rain. Generally, the ditch depth of the seedbed is preferably at least 25 cm.
top dressing
Generally, seedlings can be applied 2-6 times in seedling growth period. According to the characteristics of seedlings, 10-20 kg of urea or compound fertilizer can be applied. The shoots are applied once every 10 days. The amount of urea or compound fertilizer is 5 kg. / Around the time, the later 10-15 kg / time.
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