What about lettuce and worms?
The economic benefit of lettuce is very high, it has good planting value and edible value, and it is planted widely. What if lettuce worms do in the planting process?
What about lettuce and worms?
Lettuce is generally rarely infested, the main pests are aphids, aphids often gather on the leaves, constantly sucking the leaf juice, so that the mesophyll tissue disappears, leaving only one epidermis, it is best to wither and die.
Control method: 1500 times solution of imidacloprid wettable powder or yellow board is used in the outbreak of aphids.
Second, other common diseases
1. Soft rot: soft rot occurs mainly in the late growth stage or heading stage of lettuce, its pathogen is mainly latent in the soil or diseased plants overwintering, in the transmission of infection through watering and fertilization, usually when the plant appears a wound, the infection invades from the wound. At the initial stage of the disease, the infection was infiltrated and translucent, and with the development of the disease, irregular watery spots were formed, with brown sticky matter and stench, which finally led to the decay of the whole seed bulb.
two。 Downy mildew: downy mildew is a major disease in the production of lettuce, which usually occurs in the spring and autumn, from seedlings to adult plants, and adult plants suffer more seriously. It mainly harms the leaf part of lettuce, when the disease occurs, the leaf appears light yellow disease spot, and the downy mildew layer appears on the back of the leaf in the humid environment, and when it is serious, it will spread to the leaf surface, and in the later stage of the disease, the leaf will die.
3. Sclerotinia sclerotiorum: Sclerotinia sclerotiorum mainly harms the base of the stem of lettuce, when the disease occurs, there are yellow-brown waterlogged spots at the base of the stem, and finally the disease develops and gradually spreads to the whole stem, making it appear rotten leaves and rotten heart, and finally the whole plant wilts and dies. Flocculent mycelium was also produced in the lesion at high temperature, which was later transformed into black mouse fecal sclerotia.
Lettuce will appear some insect pests and diseases, if it occurs, according to the specific situation, choose a suitable way to kill and control.
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