Prevention of golden apple snails in the rice field 28/10/2021

MSc Huynh Kim Ngoc

USE DIOTO 250 EC, DIOTO 830 WG FOR PREVENTION OF GOLDEN APPLE SNAIL IN THE RICE FIELD

Golden apple snail is an exotic pest, originating from Brazil, introduced into Vietnam around 1985, the first damage was recorded in 1994 in Kien Giang and Ho Chi Minh City. Golden apple snails live in fresh water, acidic fields, alum, pH < 4 or salinity > 0.6% snails cannot live. Snails cause damage by biting off the seedling from sowing until about 20 days later. The  sown field was more severely damaged than the transplanted field. Snails can cause damage around the clock, but usually cause damage mainly in the  late afternoon and evening.

 

To prevent and control golden apple snail, it is necessary to apply a combination of measures, which must be done continuously, widely and early before the season begins. Measures include placing nets at culverts, tree trunk made culvert to drain water, dredging trenches, catching snails by hand, planting stakes to collect eggs, plowing well, plowing deeply, bringing water into the field early (before sowing to lure snails out. then kill, do not put water into the field soon after sowing, just keep the field moist  enough, in case of too many snails, the above measures are not effective, it is necessary to use snail killer such as DIOTO 250EC, 830WG. It should be noted that if the treatment with Chemical prophylaxis should follow the instructions on the label.

DIOTO means Good Snail Killer, contains the active ingredient of Niclosamide, there are two forms of preparations:

Emulsifiable concentrate  (EC), Niclosamide content: 250 grams/L.

Granular form (WDG), Niclosamide Olamine content: 830 grams/kg.

DIOTO acts very quickly on respiratory and digestive functions, prevents sugar absorption and metabolism, making snails unable to absorb oxygen and nutrients but dies only after 15 to 30 minutes of spraying. DIOTO kills both large snails, small snails, thoroughly effectively, thereby saving control costs (products, time, labor). DIOTO is easily degraded by light, so it decomposes very quickly in the environment. DIOTO has little effect on the growth and development of rice and  ecosystems in water. Spray DIOTO on the field, then a few days later, ducks are released to eat snails. So far, no resistance of snails to niclosamide has been recorded. Just spray DIOTO once, follow the instructions, kill snails for the whole crop. DIOTO belongs to toxic group 5 GHS, non-toxic to bees, birds, goats, sheep, low toxicity to humans, livestock and mammals, recommended by WHO for use in rice fields.

User manual:

* Dioto 250EC: Dosage: 1 liter/ha. Mix 100 ml of product in a 16-liter tank to spray for 1 field (1,000 m2).

* Dioto 830WDG: Dosage: 200 - 600g/ha, depending on the field with more or less snails, can mix from 20g to 60g/16-liter tank to spray for 1,000 m2.

Some note:

+ Spraying time: DIOTO can be sprayed at the following times:

* Spraying before sowing: A few days before sowing, lead water into the field, lure snails to emerge and then spray, then prepare the soil for normal sowing.

* Spraying after sowing: Spray as soon as water is taken into the field to prepare for the first wave fertlization (about 7-10 days after sowing).

+ Water level: When spraying, keep the water level about 3-5 cm. After spraying, continue to keep water for at least 2 days to kill all remaining snails. To ensure the complete destruction of snails, it is necessary to pay attention to: (1) do not spray when the field has no border, (2) the field is sown under water or (3) the water level in the field is too deep (over 5cm).

+ Should spray in the cool  late afternoon.

 

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