PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST Diamondback moth (DBM) on cabbage Plutella xylostella (syn. maculipennis) Esa Prevention Monitoring Direct Control Direct Control Restrictions l Plant cabbage in March to June, or l Start monitoring for moths l Use overhead irrigation l When using a pesticide or botanical, always wear before September to avoid high when cabbage is at 4-leaf which can reduce moth protective clothing and follow the instructions on the incidences of egg laying moths stage, scout for small light populations by dislodging product label. l Rotate with non-Brassicas such as greenish, sometimes grey- the pest from the plant onions, legumes and cereals for at greenish, thin larvae on leaves surface l Do not use chemicals with the same mode of action year after year as this can lead to resistance. Always consult Adult diamondback moth least 2 years and stems l Plant trap crops such as the most recent list of registered pesticides of MOFA, (©Georg Goergen/IITA Insect l Continue inspecting weekly mustard and rape at the Museum, Cotonou, Benin) l Remove all crop debris including Ghana weeds at least 4 weeks prior to especially on the underside of edges of the field to reduce the leaves DBM attack sowing to reduce moth population l Spray Bt based insectide l WHO class III (Slightly l Transplant only healthy seedlings l Look out for DBM larvae which l Collect and destroy moth e.g. Bypel 1 (Perisrapae hazardous) PHI-14 days; free of eggs, caterpillars and when disturbed, will rapidly eggs and larvae by crushing Granulosis virus + Bacillus REI 1 Day, spray at 14 pupae of the the moth wriggle their bodies back and or keeping in a bucket of thuringiensis), 550g/Ha, days interval, ensure forth soapy water Stomach poison IRAC 11A thorough spray l Slash left-over cabbage stems coverage. Causes after harvest to avoid regrowth l Use lure traps to monitor adult l Spray with NEEMROC moderate eye and skin which act as breeding grounds for moth populations; use water/ 0.03% EC (Azadirachtin irritation the moths funnel/Wota T traps at 2 traps / 0.03% w/w (32% neem oil) Larvae of diamondback moth ropani. The traps should be at 1L/acre. Spray every 10 feeding on cabbage leaves l Establish nursery beds away from suspended about 2-4 feet days from seedling until l Spray folliage with l WHO class II (CABI) production fields to prevent cross high). Check traps twice a head formation imidacloprid + emamectin (Moderately hazardous) ; infestation benzoate insecticide (e.g. PHI-7, REI -1 day week early in the morning l Spray Novaluron (Rimon Dean 62 EC) at a rate of l Use insect-proof screens to screen l Use control when 5 or more 10EC) at a rate of 100g/l. A 12g/l. IRAC 4A + 6 seedlings from adult moths that adult moths are caught in a benzoylphenol urea insect invade to lay eggs trap growth regulator. WHO l Spray folliage with Lambda- l WHO class II class U cyhalothrin product (e.g. (Moderately hazardous) Clear 2.5 EC, Lambda super Yellow colour band; REI- 2.5EC, Kombat 2.5EC) at when spray dries; PHI-3 25g/L IRAC 3A days; Damage on cabbage plant due to diamondback moth infestation (B. K. Badii, UDS, Ghana) Ghana CREATED/UPDATED: March 2016 AUTHOR(S): Paul Kiige (MOALF), Eunice Ringera (KEPHIS), Philip Wendot (UON), Benson Masinde (MOALF), Miriam Otipa (KALRO) Kenya. Modified for Ghana by: Benjamin K. Badii (University for Development Studies), Antony Cudjoe (Private Consultant) and Maxwell Awuku (Chemico Ghana Ltd.) EDITED BY: Plantwise LOSE LESS, FEED MORE Plantwise is a CABI-led global initiative www.plantwise.org.