Rice sucking bugs

Featured Photo: 
Other Photos: 
feaured_photo_co: 
Russ Ottens, University of Georgia, Bugwood.org
Is this a Minor Pest?: 
Yes
Minor Pest Title: 

Rice-sucking bugs, stink bugs (Aspavia spp, Nezera viridula), and Alydid bugs (Mirperus spp.and Riptortus spp.)

Minor Pest Description: 

Stink bugs produce a strong odour when disturbed. Adult Aspavia bugs are brown bugs with a large triangular shield on the back having three yellow spots and a spine at each side of the thorax. Nezera viridula is green and about 1.2 cm long. Alydid bugs have a long slender body and lack a triangular shield on the back. Riptortus is stout and varies from light to dark brown; the hind legs are enlarged.

Both nymphs and adult bugs feed sucking rice grains in the milky stage. When grains have ripened the bugs feed on panicle stalks and pedicels. Riptortus bugs also feed on hard dough rice grains. Bug feeding causes pecky rice that is partially or wholly stained due to infections with bacteria and fungi. The glumes change colour first to light brown, then darker and may turn grey in severe cases. Damage grains are shrivelled and unfilled. Severity of the damage depends on the stage of grain development and on the number of punctures in the grain.

 

Minor Pest What to do.: 
  • If necessary spray plant extracts. A number of plants (lantana, garlic, oleander, African marigold, blackjack, goat weed, wormseed, among others) are reported as effective against various species of bugs (Elwell and Maas, 1995).

    Pyrethrins are recommended for control of sucking bugs in organic production in USA (Layton, 2004).

Minor Pest Position: 
10
Minor Pest Firstcontent: 
136
Pest Type: 
insect
Host Plants: 
Rice