Pest identification
What's eating my greenstem forsythia?
Aphids
Signs: Sticky honeydew and curled leaves on soft shoot tips in spring and early summer.
Control: Water-jet dislodge; insecticidal soap spray; promote beneficial insects by avoiding broad-spectrum pesticides.
Four-lined plant bug (Poecilocapsus lineatus)
Signs: Round, dark-edged sunken spots on leaves; mostly cosmetic but heavy infestations weaken growth.
Control: Remove affected leaves; nymphs can be hand-picked. Pyrethrin contact spray if infestation is heavy.
Spider mites (Tetranychus urticae)
Signs: Fine pale stippling on leaves; fine webbing on undersides during hot, dry summer periods.
Control: Increase humidity; strong water spray on leaf undersides. Miticide or neem oil for serious outbreaks.
Deer
Signs: Tips and stems browsed in winter/spring; young plants can be set back significantly.
Control: Physical fencing; apply deer repellent sprays regularly until plants are well established.
Keep greenstem forsythia pest-free
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Greenstem Forsythia pests — FAQ
What is eating my greenstem forsythia?
Greenstem Forsythia shares the pest profile of other forsythias — aphids on new shoots are the most regular problem, and four-lined plant bugs cause spotting in US gardens. Deer browse the flexible green stems, and spider mites can flare in hot, dry spells. Pest pressure overall is low on this tough species.
How do I get rid of aphids on greenstem forsythia?
Sticky honeydew and curled leaves on soft shoot tips in spring and early summer. Water-jet dislodge; insecticidal soap spray; promote beneficial insects by avoiding broad-spectrum pesticides.
How do I get rid of four-lined plant bug (poecilocapsus lineatus) on greenstem forsythia?
Round, dark-edged sunken spots on leaves; mostly cosmetic but heavy infestations weaken growth. Remove affected leaves; nymphs can be hand-picked. Pyrethrin contact spray if infestation is heavy.
How do I get rid of spider mites (tetranychus urticae) on greenstem forsythia?
Fine pale stippling on leaves; fine webbing on undersides during hot, dry summer periods. Increase humidity; strong water spray on leaf undersides. Miticide or neem oil for serious outbreaks.
How do I get rid of deer on greenstem forsythia?
Tips and stems browsed in winter/spring; young plants can be set back significantly. Physical fencing; apply deer repellent sprays regularly until plants are well established.