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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

Armyworm on maize

Mythimna separata maize armyworm, paddy armyworm, Chinese armyworm, 粘虫 in Chinese
China
  • Control grassy weeds as they are egg laying sites of armyworms.
  • Plant trees as barriers around fields to divert armyworm moths.
  • Deep plough after harvest to expose in-soil hibernating pupae.
  • Rotate maize with non-cereals, such as legumes.
  • From the north, armyworm moths immigrate to Henan in July
  • The management of armyworm is based on early detection.
  • Young tiny less than 1 cm dull white to greenish caterpillars with orange head only cause small holes in leaves.
  • If about 1 to 3 small larvae are found per 10 plants consider control action.
  • Older up to 3 cm light brown caterpillars with narrow white dorsal line eat large areas of leave edges, leaving leaf blades, or eat up entire leaves. Direct control is then often too late.
  • Release parasitic flies 2 to 3 times in weekly intervals (Exorista civilis order at Taobao) Release when caterpillars are 1 to 2 cm small.
  • Pour kerosene around maize field to repel armyworms.
  • Place MFE black light lamps around field to interfere with adult moths` flying path when immigrating in large numbers.
  • When using a chemical or botanical pesticide, always wear protective clothing and follow the instructions on the product label.
  • WHO toxicity class II pesticides may not be allowed in certain IPM or “green” production schemes.
  • Always consult recent list of registered pesticides of ICAMA/China, and of China pesticide information network.
  • Cypermethrin - products (such as 灭百可 10%EC, 安绿宝 10%EC,兴棉宝 10%EC, 赛波凯10%EC, and others. Pyrethroid group, contact insecticide. Spray 灭百可 at 0.37 ~ 2.33g active ingredient per mu with water according to product label. Apply flat spray with good coverage to reach young larvae.
  • WHO toxicity class II (moderately acute hazardous); pre-harvest interval p.h.i. 15 days; restricted re-entry interval 1 day after spray. Max 2 sprays per season in min 7 day intervals. Do not mix with alkaline pesticides. Apply pesticide before 9 a.m or after 5 pm. Pyrethroids do not work well above 25 C. Do not spray near water sources, because toxic to aquatic organisms. Toxic to bees, thus do not spray in/near flowering crops or bee hives.
  • Fenitrothion-based products (such as 杀螟松 12%EC, and others). Organophosphate group of contact pesticide.
  • WHO class II (moderately acute hazardous); p.h.i. 21 days, r.e.i. 1 day; max 2 sprays per season. Easy to decompose in high temperature. Toxic to bees, thus do not spray in/near flowering crops or bee hives.
AUTHOR(S): Institute of Plant Protection, CAAS, & Graduate School of Chinese Academy of Agricultural Sciences, Beijing, China: Guo Dong,phone: +86 13161164855, email 624389434@qq.com; Cheng Lili, phone: +86 13161161224. email 975628286@qq.com

CREATED/UPDATED: February 2016 for Henan province
PRODUCED BY: Plantwise

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