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Rice Doctor fact sheets

Replanted areas

Replanting may cause differences in maturity and may also result in direct losses with seed being lost due to shattering or lower head rice recovery at milling

Rice bug

Rice bugs damage rice by sucking out the contents of developing grains from pre-flowering spikelets to soft dough stage, therefore causing unfilled or empty grains and discoloration

Rice caseworm

Rice caseworms cut off leaf tips to make leaf cases. Their feeding damage can cut leaves at right angles as with a pair of scissors

Rice gall midge

Gall midge forms a tubular gall at the base of tillers, causing elongation of leaf sheaths called onion leaf or silver shoot

Rice grassy stunt

Rice grassy stunt virus reduces yields by inhibiting panicle production

Rice hispa

Rice hispa scrapes the upper surface of leaf blades leaving only the lower epidermis

Rice leaffolder

Leaffolders feed inside the folded leaf creating longitudinal white and transparent streaks on the blade

Rice ragged stunt

Rice ragged stunt virus reduces yield by causing partially exerted panicles, unfilled grains and plant density loss

Rice skipper

Rice skipper is considered as a minor pest in rice. Yield losses caused by their feeding damage is very rare

Rice stripe virus disease

Rice stripe virus disease can cause high yield losses when severe epidemics occur. The virus is transmitted mainly by the small brown planthopper

Rice thrips

Feeding damage caused by thrips causes leaf curling and discoloration

Rice whorl maggot

The rice whorl maggot begins to infest the rice plant at transplanting. It locates rice fields by reflected sunlight from the water surface

Root aphid

Root aphids suck the plant to remove fluids. The feeding damage causes yellowing of leaves and stunting

Root grub

Root grubs feed on roots or loss roots. This can lead to abnormal plant height, discoloration of plant, and wilting

Root knot nematode

Rice root-knot nematode is considered one of the limiting factors in rice production in all rice ecosystems

Salinity

Salinity affects the respiration and photosynthesis of plants.

Seed Rate (High)

When seeding rate is high, plant count is high and crop stand becomes too dense

Seed rate (Too low)

When seeding rate is too low, plants have low crop stand, low ground cover, and they experience greater weed pressure

Seed too deep

When seeds are planted too deep, plants have poor growth, poor emergence, low vigor, and low crop stand

Seeder clogged

When the drill or drum seeder used is clogged, no seeds can come out; thus, no plants will grow

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