Ratwort is also known as watermelon worm, tide worm, pu shoe sole worm, arthropod, crustacean and other foot rat women rat women. It is distributed throughout the country, endangering cyclamen, violet, melon leaf chrysanthemum, cactus and so on.
[1] Hazard characteristics
The larvae and adults feed on the young rhizomes, causing poor growth, yellow branches and leaves, and the whole plant dies in severe cases. At the seedling stage, there are holes or breaks in the ridges of seedlings, young shoots, young roots or stem bases, causing ulcers, dead branches and yellow leaves, and even the whole plant dies, especially after the lawn grass is damaged; strawberry berries have holes; the stems of vine plants continue to endanger new vines after being killed.
[2] Morphological characteristics
Adult: 10 to 14 mm long, 5.0 to 6.5 mm wide, oblong-oval, 13 segments in total, grey-brown, head with 1 pair of eyes and 1 pair of linear antennae. Chest 8 sections, section 1 with the head joint, other energy saving free movement. Each segment has a rounded ventral surface with 1 pair of equal length feet. The abdomen is small with a pair of small flaky protrusions at the caudal end. Female adults have a dark brown back, faintly visible yellow-brown cloud-like patterns, and white edges at the posterior margin of each segment; males are greener and darker. Eggs: yellowish brown, nearly spherical to ovate. Larvae: The hatching larvae are white, translucent, about 1.3 to 1.5 mm long and 0.5 to 0.8 mm wide, and gradually darken in color as the individual grows. The larval morphology is similar to that of adults.
[3] Occurrence law
In 1 generation per year, adults lay eggs in the lower ventral "pocket" and leave the mother after hatching. It mostly occurs in dark, damp places, such as corners of walls, under earth and stones, and is afraid of drought. Generally, the harm of night out is the mainstay, with 21:00-22:00, 7:00-8:00 the most active, cloudy days also come out of the activity, in the back of the wet place where the sun does not see the sun all day, sunny days also come out of the activity. Seedlings, young shoots and ground-pressed fruits are heavily affected. There is a tendency to circle fertilizer and rotting grass, there is pseudo-death and negative phototropism, and it is immediately curled up into a watermelon shape after being disturbed. The life expectancy is more than 1.5 years.
[4] Prevention and control measures
1, lawn, flower bed should be applied to fully decomposed manure, hemp cake and other organic fertilizer, uncorried organic fertilizer should not be applied.
2, lawn, flower bed around the need for isolation, it is best to use bamboo poles to make a fence, do not build brick walls or stone walls.
3. When the rat woman in the lawn and flower garden is serious, she can pile grass between the field and the ridge to rot and carry out booby traps.
4, pharmaceutical prevention and control: 20% insect death net wettable powder 2000 times liquid, 50% octyl thiophosphorus emulsion 1000 times liquid or the use of Kilindi insect jing, Huoji can control a variety of underground pests.
