Author: (Walsingham, 1900)
Species Overview:
Adult: 18-20 mm wingspan; forewing strongly variable, pale yellowish brown to brownish cream with brownish markings (may be atrophied in females); apex of forewing produced; hindwing pale grey, with androconial scales that cover the anal area to vein CuA 2 or even CuA 1.
Larva: Matsumuraeses falcana larva
Pupa: Matsumuraeses falcana pupa
Taxonomic Description:
Male:
Matsumuraeses falcana male
Matsumuraeses falcana males
External characters: 18-20 mm wingspan. Apex of forewing produced; forewing strongly variable, pale yellowish brown to brownish cream; markings brown suffused with grey, outer edge of basal patch strongly oblique, irregular, strigulated with dark grey; costal strigulae dark fuscous, a dark fuscous streak or some undefined short lines beneath these; a dark fuscous spot present posterior to centre of wing and some smaller spots along termen. Hindwing pale grey, with androconial scales that cover the anal area to vein CuA 2 or even CuA 1 (Razowski and Yasuda, 1975).
male genitalia M. falcana
Genitalia: Socii large, fused, with long hairs. Valva constricted medially; apex of cucullus angulate ventrally and produced dorsally; ventral margin of cucullus strongly convex proximally. Aedeagus curved, fairly slender, with small cornuti.
Female:
Matsumuraeses falcana female
M. falcana females
External characters: Somewhat smaller than males; forewing yellow-brown to ferruginous brown or brown; markings ill-defined or completely atrophied; anal area of hindwing without androconial scales.
female genitalia M. falcana
Genitalia: Sterigma elongate, deeply incised in middle of posterior edge, somewhat variable in shape. Seventh sternite with large subtriangular lateral lobes. Corpus bursae with two signa.
Biology
(Data concern Japan)
There are probably three to four generations yearly. Moths occur from early April until late November.
In the past, this species was synonymized with Matsumuraeses phaseoli, and it is therefore difficult to collect data that concern this species.
Host plants:
(Data concern Japan)
Robinia prseudoacacia, Trifolium pratense, Lupulus sp., Glycine max., Pueraria lobata.
Damage:
Matsumuraeses falcana damage to leaves of Pueraria lobata.
Larvae are found feeding on (cultivated) soy bean (Glycine).
Distribution:
Nepal, Southern China, Taiwan, Japan, Indonesia (Java).
Pheromone:
E 8E 10-12Ac : 3.1 *
E 8Z 10-12Ac : 0.28
E 7E 9-12Ac : 0.36
E 7Z 9-12Ac : 0.88
E 10-12Ac : 0.29
E 8-12Ac : 3.7 *
12Ac : 13.3
E 10-14Ac : 0.05
14Ac : 0.1
18Ac : trace
Components marked with * are involved in attraction (Wakamura, 1985).