Sweet potato (scientific name: Ipomoea batatas (L.) Lam.) is also known as sweet potato, sweet potato, vermilion potato, golden potato, sweet potato, sweet potato, a goose, and sweet potato. Annual herbaceous plants, the underground part has round, oval or spindle-shaped roots, the stem is flat or rising, occasionally entangled, multi-branched, the shape and color of the leaves often vary from variety to species, usually widely ovate, petiole length is different, polygonal inflorescence axillary, capsule ovate or flat round, seeds 1-4 grains, usually 2 grains, glabrous.
< h1 class= "pgc-h-arrow-right" > understand sweet potato moths</h1>
In the process of sweet potato planting, many diseases and insect pests will be encountered, and the sweet potato moth is one of the more troublesome.
Sweet potato moths belong to the Lepidoptera family. It is very widely distributed and occurs in various sweet potato growing areas in our country. It mainly harms sweet potatoes, but also eats spinosaurs such as morning glory. The larvae can cause harm to the leaves and young stems of sweet potatoes, and can eat the leaves in severe cases, which has a great impact on crop yield.
Adults of this pest appear gray-brown, with body lengths between 43 mm and 52 mm and wingspans between 100 mm and 120 mm. The forewings are greyish brown with many serrated and cloudy markings, while the hindwings are pale grey with 4 black-brown diagonal bands. The antennae of the male moth are ctenophoric, and the antennae of the female moth are stick-like and expand at the end. The eggs appear spherical, pale yellowish-green, and are about 2 mm in diameter.
The mature larvae are between 100 mm and 120 mm long, the body color is green and brown, there are 5 years old, the top of the head is rounded, and a smooth curved tail horn appears on the back of the eighth abdominal segment. The pupal is about 56 mm long, brown, with a long beak protruding and curved to appear like a trunk.
In Henan Province, 3-4 generations will occur each year to pupate about 10 cm below the soil for the winter. Feathered in May of the following year. Adults lurk during the day and fly out after dusk. Adults have strong phototropism and can migrate to distant places for reproductive hazards. Initially, the hatching larvae have a habit of feeding on the egg shell, and the older the worm, the greater its feeding.
<h1 class = "pgc-h-arrow-right" > control measures:</h1>
Agricultural measures.
In the winter and spring, more ploughing of the rake sweet potato field destroys the overwintering environment of the pest, eliminates the pupae, and reduces the source of the insect; combines with field management in the early stage to kill the larvae; uses the nectar habit of the adult to suck nectar, uses syrup bait to trap the adult insects during the peak period, or hunts in places where there are many sources of honey to reduce the amount of eggs in the field.
Second, pharmaceutical prevention and control.
Spray 1.5 kg to 2 kg to 2 kg per 666.7 square metres with 1.5% vermicelligent powder or 1.5% 1605 powder to 2 kg per 666.7 square metres, or 90% crystalline dichlorvos or 80% dichlorvos emulsion 2000 times liquid spray.