|Asiatic rice borer|
Chilo suppressalis, the Asiatic rice borer or striped rice stemborer is a moth of the Crambidae family. It is a widespread species, known from India, Sri Lanka, China, eastern Asia, Japan, Taiwan, Malaysia to the Pacific.
It is a serious pest of rice. They are largely responsible for the great reduction in the rice growing in East Asia, India and Indonesia. It was probably introduced in Spain and Hawaii by humans, where it is widely spread towards Northern Territory of Australia.
The wingspan is 18 mm in male and 18–20 mm in female. In the male, the head and thorax are brown and white. Abdomen pale. Forewings with somewhat acute apex which is ochreous, wholly suffused with brown except a patch in cell and a streak below medial nervure. Inner margin whitish. A sinuous rufous medial line runs with silvery spots on its inner side, also on discocellulars, and below vein 2. A rufous submarginal line, highly angled at vein 6 and with silvery line on its outer edge. A marginal series of black specks found. Cilia rufous. Hindwings whitish.
In the female, it is much more orange-fulvous colored. Forewings irrorated (sprinkled) with brown. Medial and submarginal lines almost obsolete. The silvery spots below the cell prominent and sometimes double. The postmedial area irrorated with silvery scales.
Ecology and life cycle
Eggs are scale like and translucent white to dark yellow. These naked clusters consist of nearly 60 overlapping rows.
First-instar larvae are greyish white with a black head. Head capsule gradullay turns brown towards final stages. Full-grown larvae are yellow, with five, dim, longitudinal lines, and can grow to a length of about 25 mm.
Apart from the major food plant, rice, larvae also feed on wide array of plants such as Gigantochloa verticellata, Echinochloa crusgalli cruspavonis, Echinochloa stagnina, Eleusine indica, Panicum sp., Paspalum conjugatum, Amaranthus sp., Phragmites australis, Raphanus raphanistrum, Sclerostachya fusca, Sorghum sp., Typha latifolia, Xanthium strumarium, and Zizania aquatica.
Pupation takes place in a stem of the food plant. Pupae are reddish brown with two ribbed crests on the pronotal margins. Several spines are located in the cremaster on the last abdominal segment.
They bore the stems of their host plants, and therefore are classified as rice stem borers.
Almost all plant parts, from twigs, leaves, stems are attacked. Caterpillars can be largely internal feeders, whereas adults are external sap feeders. Heavily attacked plants can show varying symptoms from dead heart, white heads, dwarfing, stunting, rot, abnormal forms, and rosetting. Finally the whole plant will die. Dead hearts are the most obvious field symptoms.
The pest should diagnosed early in the symptoms, unless it is not worthy to protect the cultivation. Many traditional and agricultural practices like flooding and harrowing or ploughing to turn in stubble and straw are effective to prevent pests in the next growing season. The use of early-maturing varieties and at harvest, planting synchronization and stem removal close to ground is managed.
Notes and references
- Ge, Z. Y.; Wan, P. J.; Li, G. Q.; Xia, Y. G.; Han, Z. J. (2014). "Characterization of cysteine protease-like genes in the striped rice stem borer, Chilo suppressalis". Genome. 57 (2): 79–88. PMID 24702065. doi:10.1139/gen-2013-0188.
- Gao, Junchuan; Li, Weimin; Jiang, Guorong (1987). "Discussion on the economic threshold of the striped rice stem borer (Chilo suppressalis Walker)". Acta Phytophylactica Sinica. 14 (2): 107–114.
- Hampson G. F. (1896). The Fauna of British India Including Ceylon and Burma: Moths. IV. Taylor & Francis. Retrieved 19 August 2017.
- "Chilo suppressalis (striped rice stem borer)". CABI. Retrieved 17 October 2016.
- "IRRI Rice insect pest factsheet: Stem borer". Rice Knowledge Bank. Archived from the original on 22 November 2014.
- "Striped rice stem borer (Chilo suppressalis)". Plantwise Technical Factsheet. Retrieved 17 October 2016.
- Insects of Hawaii. Volume 8, Pyraloidea
- Australian Insects
- Rice striped stem borer, Chilo suppressalis (Lepidoptera: Pyralidae), overwintering in super rice and its control using cultivation techniques
- Chilo suppressalis (Lepidoptera: Pyralidae) in Taiwan
- Chemical control of the striped stem borer, Chilo suppressalis (Walker) in rice
- Asiatic rice borer
- Biological cycle of Rice Stem Borer, Chilo suppressalis
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