What are the causes of abnormal cucumber plants?
1. physiological calcium deficiency
Symptoms in the field: cucumber calcium deficiency is a common physiological disease in cucumber during the period of stretching and spreading. It is easy to cause growth problems and bad growth. In the 9 ~ 14 leaf stage of cucumber prone to calcium deficiency symptoms, onset of upper leaf shape slightly small, curled up inside or outside, near the point of growth of cupped leaves, leaf margin curling die, severe adhesion growth necrosis, wet, and vulnerable to bacterial infection, appear on the surface of gray mold layer. Calcium; cucumber vine plant growth is the fastest, the evaporation rate is fast, easy calcium, growth and nutrient deficiency in the greenhouse during the encounter long time low temperature, light and other adverse conditions, poor root damage, prone to calcium deficiency symptoms. Cucumber calcium deficiency is a physiological disease of cucumber, do not have infectivity, appear in the field of individual plants, leaf symptoms had no obvious effect on fruit.
2. scab damage
The symptoms: in the production process of cucumber scab is one of the most devastating diseases, can growth and damage of cucumber leaves, fruit, vine tendrils and other parts, especially the thought and growing point of the most serious disease after 2 ~ 3 with the growth of D can be broken, the formation of "bald pile". Tendrils of brown rot disease; leaf spot near circular perforation, and vine petiole. Disease middle sag, scab formation. General scab easily occurred in the seedling stage and fruiting stage, fruit damage, plastic flow, disease is easy to form a scab, deformity melon, the characteristic is the essential difference between calcium and scab of cucumber.
3. thin diseases
Cucumber blight can damage leaves, stems and leaves of cucumber fruit, young victims, edge appears nearly round dark green spots, after showing rot disease gradually shaped drooping, dense mold shaped white, even the cloudy ceiling indoor humidity caused by the growing point of victimization, adhesion and necrosis.
Cucumber plant abnormal how to do?
1. prevent cucumber top necrosis
Can every 667 M2 application of high calcium magnesium potassium 25 kg, or in the 8 to 9 leaf stage plants (appear symptom of calcium deficiency, calcium phase) spraying foliar fertilizer, such as amino acid, Gao Chungai, foliar fertilizer, calcium supplement, avoid calcium deficiency during the growth and development of cucumber. The cucumber blight can choose 69% Dimethomorph WP 800 times or 72% DuPont Keluke WP 500 times liquid spray control. Scab control method, using 50% Au Ghana WP 500 times liquid spray control.
2. the growth point of cucumber was disappeared
(1) selection of low temperature resistant varieties
Greenhouse cucumber cultivation is forced growth under the condition that environmental conditions can not fully meet the normal growth and development of cucumber, and its growth is relatively weak, and its resistance is poor. Can choose low temperature, weak light varieties, such as Tianjin 30, Li 21, etc..
(2) regulate and control temperature and humidity scientifically
The greenhouse cucumber four temperature management: half a day to keep the temperature 25 to 30 DEG C in greenhouse, air relative humidity 30%-70%; day temperature 25 to 30 DEG C, humidity 65% ~ 90%, 20 ~ 15 degrees before the midnight temperature, humidity 90% ~ 95%; after midnight temperature 15 ~ 10 degrees, humidity 95% ~ 100%. Especially in the middle of the night, the temperature can not be lower than 15 DEG C, so as to facilitate the transportation of nutrients and make the growth point of cucumber get adequate nutrition. The temperature and humidity with cold film, science ventilation, Zhang Gua reflection curtain measures regulating greenhouse, which can meet the needs of normal growth and development of cucumber, and can effectively control the occurrence of cucumber growing point disappear disease disease.
(3) strengthening cultivation and management;
Through the cold acclimatization and seedling cultivation, organic fertilizer and potash fertilizer, fertilizer, biological fertilizer and the cultivation and management of technical measures, improve the resistance of cucumber, promote healthy growth. Show that in recent years in the test, Cucumber Planting, fertilizing method of sugar can avoid the growth point for cucumber root growth and the emergence of the phenomenon of the disappearance of adverse occurrence and damage to a great extent.
(4) raising the night temperature in shed and reducing the temperature difference between day and night
To have occurred in the greenhouse cucumber growth point disappear, increase the greenhouse temperature at night, especially before midnight (temperature greater than 18 DEG C), reduce the temperature difference between day and night, promote vegetative growth, reproductive growth inhibition, promote hair growth point.
(5) reasonable irrigation and fertilization;
Timely and appropriate irrigation, the soil moisture in greenhouse is more than 90%, to ensure no shortage of cucumber. The application of quick acting fertilizer was 10~15 kg per 667m2, and 1 times every 10d. Foliar spraying of plant power 2003, Tianda 216 and other regulators, to accelerate the recovery rate of growth point.
