Table 1 Symptomatology observed in the weeds: Rumex crispus, Digitaria horizontalis, Persicaria nepalensis, and Thunbergia alata under field conditions

R. crispus

Slightly round lesions dark brown necrotic in the center concentric in appearance rough in texture and often with surrounding chlorotic areas

R14

Small circular spots reddish or purple randomly distributed throughout the leaf tissue and plant stem smooth in texture and often with a small whitish center

R15

R19

D. horizontalis

Round-shaped dark brownish lesions with a concentric appearance and slightly sunken texture surrounded by a chlorotic halo

D30

P. nepalensis

Small spots of purplish or purple color circular in shape with a whitish center of smooth texture

P4

P5

Semicircular lesions with the appearance of concentric rings light brown in the center slightly sunken and surrounded by a purplish color growing rapidly on the leaf tissue

P7

T. alata

Necrotic lesions of irregular shape rough in texture and black or sometimes dark brown eventually surrounded by a chlorotic halo

T7

Spots initially yellow in color and semicircular or irregular in shape which grows until they coalesce and make the tissue appear chlorotic. Advanced lesions darken to brown with a defined center

T10