The scientific name Ampullaria gigas Spix is ​​a large aquatic snail. Different name Ampullarium crosseana, Pomaceacineata, Pomacea canaliculata, A.insularus. Distributed in Guangdong, Guangxi, Fujian, Hainan, Taiwan and other provinces.
The host plants such as rice, white peony root, water chestnut, water spinach, citrus aurantium and other aquatic crops and sweet potato and other dry crops near the waters.
After being hatched for a long time, it started to eat aquatic plants such as rice, especially the young part. Snails are new pests. The main damage period is after transplanting rice till the field. It bites and cuts rice main stubble and effective tilling, resulting in reduced effective panicles and reduced yield.
Morphological features Shell appearance is similar to snails. With a spiral shell, the color varies with the environment and the age of the screw, there are shiny and a number of fine vertical stripes, head and stomach feet outstretched when crawling. The head has 2 pairs of antennae, the front antenna is short, and the back antenna is long. There is one eye on the outside of the base of the posterior antenna. The left side of the screw has a thick lung pipette. Shells are thick, shell height is 7cm, young shells are thin, shell seams are subsiding in shallow grooves, shell umbilicals are deep and wide. Shell androgynous, allogeneic mating. Oval, 2 mm in diameter, initially spawned pink to bright red, egg surface has a layer of invisible white powder, in the May-June temperature conditions, after 5 days turned pale brown to brown, when the egg It has hatched into a young snail. Eggs oval, size
Differently, the eggs are arranged in order, the egg layer is not easy to fall off, bright red, only a few tens of ovules, a large up to more than a thousand grains. Eggs are produced on the surface of dry objects or plants above the surface of the water at night, such as stems, trench walls, walls, fields, weeds, etc., and the newly hatched young snails fall into the water and ingest plankton. Spirulina matures 3 to 4 months after its development. In addition to spawning or migration in the event of adverse environmental conditions, it lives in fresh water all year long. In the event of drought, the shell is tightly closed and immobile, up to 3-4 Month or longer.
Life habits 3 generations in Guangzhou, the generation of young snails grows for 93 days and begins spawning. The egg period is 9 days. The second generation of young snails has a duration of 102 days. The average daily temperature is 27.1°C and the relative humidity is 88%. The second generation snails grow for 63 days. Spawning, egg period 11 days, that is hatched three generations of young snails, the duration of 74 days, the average daily temperature of 29.5 °C, relative humidity of 87%. Three generations of snails grew to the end of March of the following year, a total of 189 days, still young snails, the average daily temperature of 18.2 °C, relative humidity of 78%, overlapping screw generation occurred. The screw age is 20 to 80 days. After each snail has passed 10 days, the first generation gains 0.9 g, the second generation 2.398 and the third generation 0.188. The average number of young snails per generation was 3050, and the hatching rate was 70.1%. The average number of young snails per female snail in the second generation was 1,068, and the hatching rate was 59.4%. The female snails were breeding for 2 generations of young snails in 1 year and 2 generations. More than 10,000, very strong reproductive performance.
Control methods (1) When the rice field has an average of 2-3 snails per m2, it should be immediately prevented. Within 24 hours after rice transplant, 6% of MICDA Spirulina granules 0.5-0.7kg per 667m2 in the rain or evening, and mix with 5-10kg of fine sand, keep 3-4cm water layer for 3-5 days after application. . (2) Apply 2% tributyl vinegar tin granules (TPTA) 15-22.5 kg per hectare per application, apply 7 days before planting, and keep the water 3 cm deep for about 1 week. Water temperature higher than 20 °C, available 15kg; below 20 °C, can increase the amount, but not more than 22.5kg. Can also be used 80% acetic acid wettable powder (Metaldehyde), 1.2kg per hectare each, 1-3 days before planting, diluted with water, once application, field water to maintain 1-3cm deep about 7 days, the temperature requirement is higher than Applied at 20°C. (3) Apply 8% chlorhexidine granules 1.5-2kg per 667m2, crushed with fine soil or crumbs 5-7.5kg, spread to the roots of the affected plants on a warm, dry earth surface in the evening, 2-3 days later, The snails that have been exposed to the drug secrete a lot of mucus and die. The appropriate period of prevention and treatment is appropriate before spawning.
Mustard Paste,Sushi Spicy Mustard Paste,Mustard Paste For Sushi,Green Mustard Paste
NINGXIA KOFOLON INTERNATIONAL CO.,LTD. , https://www.kofolon.com