Symptom Identification and Control Methods for Lavender Wilt Disease
Lavender is a fairly common flowering ornamental plant and also a natural aromatic plant, but during cultivation, lavender can develop wilt disease, which occurs in various regions, is especially prominent at the seedling stage, and often causes patches of plants to die. It has occurred in Xi'an, Shaanxi and Xun County, Henan.
Lavender
I. Disease symptoms:When one-year-old sown seedlings or cuttings are affected, the plants first become wilted, lose water, and have dull leaf color; the tips of leaves and branches bend downward and droop, with the most obvious symptoms at the bud stage. Mild cases can recover at night, while severe cases die within two or three days, with root rot and stem vascular bundles turning brown and glossy. In seedlings over three years old, in addition to the same pathological symptoms as at the seedling stage, wilting symptoms appear in the center or at the edges of the plant and gradually spread inward and outward, branches wilt and die, and finally the whole plant dies; the degree of damage varies with plant age and variety. It generally begins in May and peaks in July and August. French lavender is severely affected, while the former Soviet Union's 2-417 variety is mildly affected.
Disease occurrence is not only related to air temperature and rainfall amount, but also to terrain height and drainage conditions. It is most prominent especially after summer rainstorms, with severe seedling death. In mild cases, slightly over ten percent die; in severe cases, more than ninety percent die.
II. Field fungicide trials:The control efficacy of "920" was about 15.5%, dinosem ammonium about 13.3%, thiophanate-methyl about 2.6%, thiophanate-ethyl about 26%, and antibiotics at 500 ppm about 23%, at 300 ppm 82%, at 200 ppm 79%, and at 100 ppm 89%, but the effect of root drenching was poor. It is recommended to strengthen management in cultivation, select disease-resistant varieties, use ridge planting in the field, cultivate in sandy soil, and apply more phosphorus and potassium fertilizer to enhance resistance. At the same time, the control methods for Fusarium wilt of crops such as watermelon, cotton, and peanut can also be used for reference.
Symptoms and Control Methods of Lavender Wilt Disease
[Symptoms] When one-year-old sown seedlings or cuttings are affected, the plants first become wilted, lose water, and have dull leaf color; the tips of leaves and branches bend downward and droop, with the most obvious symptoms at the bud stage. Mild cases can recover at night, while severe cases die within two or three days, with root rot and stem vascular bundles turning brown and glossy. In seedlings over three years old, in addition to the same pathological symptoms as at the seedling stage, wilting symptoms appear in the center or at the edges of the plant and gradually spread inward and outward, branches wilt and die, and finally the whole plant dies; the degree of damage varies with plant age and variety. It generally begins in May and peaks in July and August. French lavender is severely affected, while the former Soviet Union's 2-417 variety is mildly affected. Disease occurrence is not only related to air temperature and rainfall amount, but also to terrain height and drainage conditions. It is most prominent especially after summer rainstorms, with severe seedling death. In mild cases, slightly over ten percent die; in severe cases, more than ninety percent die.
[Control methods] The control efficacy of “920” was about 15.5%, dinosem ammonium about 13.3%, thiophanate-methyl about 2.6%, thiophanate-ethyl about 26%, and antibiotics at 500ppm about 23%, at 300ppm 82%, at 200ppm 79%, and at 100ppm 89%, but the effect of root drenching was poor.
It is recommended to strengthen management in cultivation, select disease-resistant varieties, use ridge planting in the field, cultivate in sandy soil, and apply more phosphorus and potassium fertilizer to enhance resistance. At the same time, the control methods for Fusarium wilt of crops such as watermelon, cotton, and peanut can also be used for reference.
Control Methods for Lavender Wilt Disease
Lavender is a natural aromatic plant and also an ornamental flower. During planting, a destructive disease called wilt disease occurs. Detailed reports have not yet been seen in China. The author has carried out control work, and the control methods are introduced as follows: Lavender wilt disease occurs in plantations in different cultivation regions, and is especially prominent at the seedling stage, often causing patches of plants to die. It has occurred in Xi'an, Shaanxi and Xun County, Henan.I. Disease symptoms: When one-year-old sown seedlings or cuttings are affected, the plants first become wilted, lose water, and have dull leaf color; the tips of leaves and branches bend downward and droop, with the most obvious symptoms at the bud stage. Mild cases can recover at night, while severe cases die within two or three days, with root rot and stem vascular bundles turning brown and glossy. In seedlings over three years old, in addition to the same pathological symptoms as at the seedling stage, wilting symptoms appear in the center or at the edges of the plant and gradually spread inward and outward, branches wilt and die, and finally the whole plant dies; the degree of damage varies with plant age and variety. It generally begins in May and peaks in July and August. French lavender is severely affected, while the former Soviet Union's 2-417 variety is mildly affected.
Disease occurrence is not only related to air temperature and rainfall amount, but also to terrain height and drainage conditions. It is most prominent especially after summer rainstorms, with severe seedling death. In mild cases, slightly over ten percent die; in severe cases, more than ninety percent die.
II. Field fungicide trials: The control efficacy of “920” was about 15.5%, dinosem ammonium about 13.3%, thiophanate-methyl about 2.6%, thiophanate-ethyl about 26%, and antibiotics at 500ppm about 23%, at 300ppm 82%, at 200ppm 79%, and at 100ppm 89%, but the effect of root drenching was poor. It is recommended to strengthen management in cultivation, select disease-resistant varieties, use ridge planting in the field, cultivate in sandy soil, and apply more phosphorus and potassium fertilizer to enhance resistance. At the same time, the control methods for Fusarium wilt of crops such as watermelon, cotton, and peanut can also be used for reference.