Pest management

 

 

 

 

 

Other pests

 

 

 

 

 

 

Describe other pests and how to deal with them.

 

 

 

What other pests can harm your crop and reduce the yield?

 

 

 

1. Golden apple snails

 

Snail lying eggs

 

 

 

 

 

 

 

What are Golden Apple Snails?

The golden apple snail came to Asia during the 1980ís from South America as a potential food for people. Unfortunately, the golden apple snail has become a major pest of rice having spread to the Philippines, Cambodia, Thailand,

and Vietnam.

 

Why control Golden Apple Snails?

The golden apple snail eats young and emerging rice plants and can completely destroy a crop during crop establishment.

 

Critical times for control:

The critical time to control golden apple snail is during the first 10 days for the transplanted crops and the first 21 days for direct wet-seeded crops. After this, the crop growth

is typically greater than the rate of snail damage.

 

How to manage Golden Apple Snails?

See fact sheet below.

 

2. Birds

 

 

 

Birds can be controlled by:

  1. Birdboys: If used, birdboys need to be present at critical times of 6-10am and 2pm-6pm.

  2. Birdnets: For isolated areas of less than 0.25 ha.

  3. For direct seeded fields:

  • Cover seed with soil upon planting.

  • Increase seed rate.

  • Place bird scaring devices - e.g., tape, models of hawks, kites, models of snakes.(For best effects, bird scaring devices need to be rotated.)

  • Plant in season - avoid planting or harvesting out of season, thus becoming focal points for attack.

 

3. Rodents (rats)

 

 

 

Which rodents are pests in rice?

Many rodents cause problems in rice. The main pests are the "Rice field rat", the Black rat and the lesser bandicoot rat. Mice can also cause problems. The presence of rats is usually associated with tracks

in mud and rat holes in bunds and levees.

 

Why control rodents?

Rodents cause significant losses both in the field and in post-harvest rice management. (see also Module VI:Storage)

 

What are the field symptoms?

Seed eaten at planting, plant sheaths or tillers cut at 45 degrees near the base, or missing grains or panicles.

 

Keys to effective rodent control - Different control strategies are required for different rodents. See fact sheet below for more.

 

 

 

 

(Crabs can also be a problem in some areas.)

 

 

 

 

The planting method can have a big influence on having these pests or not.

 

Direct seeding generally has more problems than transplanting.

In the table below you can see which pest may be a problem depending on the planting method used.

 

 

Is there a chance these pests will be a problem?

 

 

 

Establishment method?

Snails?

Rats?

Birds?

(Weeds?)

Transplanting

Yes

Less

No

Somewhat

Wet direct seeded

Yes

Yes

Yes

Yes

Dry direct seeded

Limited

Yes

Yes

Big

 

 

More information

 

Click on the icon to open a manual with more information on:

 

Rodent management

 

Click on an icon to open a fact sheet with specific information about:

 

Rodent control

Golden apple snail

 

 

 

Next lesson

 

This ends this module. A small quiz is up next. Good luck!