The scientific name of Branchiura sowerbyi Beddard is a ring animal door, poor class, primitive lean head. Commonly known as red sand insects, drum mud insects. Distributed throughout the country.
Host rice and various vegetables.
Damage characteristics Take humus in the soil of paddy fields or aquatic vegetable fields, although not directly harm rice seedlings, but because the body's pelvic parts turn in the soil, often the seeds are buried under the soil, no longer germinate, or cause seedlings lodging , resulting in lack of seedlings broken ridge.
Morphological characteristics Adult body length 50-80mm, red to reddish-brown, more than 120 somatic segments, in the back of the body 60-70 dorsal abdomen midline, born with slender filamentous warts, the front of the body buried in the soil In the middle, the part of the back part of the skull is stretched out of the earth. It oscillates in waves, breathes, and shrinks into the earth when disturbed.
Live habits occur in low-lying, humus-rich muddy fields and over-water fields. Often 20-30 heads live in groups and can reach more than 100 times in a long time. The shallow sandy land in the mud layer occurs less, and the activity begins when the surface temperature reaches 10°C at 12°C in the early spring. Gradually turned to the surface. It is most active at 20°C. When the soil temperature reaches 21°C, the relative humidity of the soil is high
At 50%, especially when the surface temperature in spring is higher than the deep soil temperature, the humidity is high, and the earthworms rise to the surface activity and reproduction. Part of the bristles stick out of the mud and make a wavy swing. The manure mud can be discharged in 24 hours. 20- 30 times, it is easy to cause damage to seedlings.
Control methods (1) Use 0.1% tea dry water to rinse the roots, and for each 667m2 seedlings, use tea dry 5-10kg to control 250-300kg of water to control the damage. (2) The spray-thaw and puppet worm wettable powder 150 times liquid is effective for preventing fleas. (3) When using chemical control, use 50% phoxim 50ml or 90% crystal trichlorfon 508, 80% dichlorvos 100ml per 667m2, dilute with a small amount of water and mix with 30kg of fine sand. The above dosage is sprayed on 60 kg of water. (4) In areas where crickets are of a detrimental effect, adequately cooked organic fertilizers should be applied and agricultural measures such as intermittent irrigation or paddy crop rotations should be implemented.
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