Why does your Phaseolus lunatus Buttergreen Bush have fine webbing? Diagnose the cause and fix it with our step-by-step guide.
Spider mites are highly common in legumes like Lima beans, especially in warm, dry conditions. They pierce plant cells to suck sap, leaving behind fine silk webbing and characteristic stippling (tiny white dots) on the underside of the leaves.
A specific type of spider mite that thrives on bush varieties like Buttergreen. High populations create dense webbing around leaf margins and growing tips, eventually causing leaves to turn yellow and drop.
While thrips are primarily known for scarring, heavy infestations can sometimes be accompanied by silken structures or disturbed leaf surfaces that resemble light webbing. They feed on the tender parenchyma of the bean leaves.
Your plant might also be experiencing one of these issues: