Definition

1. Noun:
   • Brown planthopper (scientific name: Nilaparvata lugens): A small, winged insect pest that primarily feeds on rice plants, causing significant agricultural damage. It is characterized by its brown color and distinctive striped markings.
   • A type of planthopper: More generally, it can refer to certain striped or variegated species of planthoppers within the family Delphacidae.

Usage Examples

• Noun:
  • Rầy vằn là một loại côn trùng gây hại nghiêm trọng cho lúa. (The brown planthopper is an insect that causes serious damage to rice.)
  • Nông dân đang tìm cách phòng trừ rầy vằn. (Farmers are looking for ways to prevent and control the brown planthopper.)

Advanced Usage

• The term is primarily used in agricultural and entomological contexts. It is often part of compound terms related to pest management.
• "rầy vằn hại lúa": brown planthopper damaging rice.
  • Mùa này thường xuất hiện dịch rầy vằn hại lúa. (This season often sees an outbreak of brown planthoppers damaging rice.)

Variants and Related Words

• Rầy nâu (n): Another common name for the brown planthopper, often used interchangeably with "rầy vằn."
• Rầy (n): A general term for planthopper or leafhopper insects.

Synonyms

• Brown planthopper: The standard common name in English.
• Rice planthopper: A general term indicating its host plant.

Notes

• The reference to "" in some dictionaries is an older or alternative scientific classification. The modern, primary scientific name for the major pest species is .
• This pest is known for sucking sap from rice plants, which can lead to "hopperburn" (yellowing and drying of plants) and can also transmit viral diseases to the crop.