Buff Arches

The Buff Arches (Habrosyne pyritoides) is a moth of the Drepanidae family, known for its distinct appearance and specific host plant preferences.

Adult moths have a wingspan of approximately 35–45 mm, with forewings featuring intricate, moss-like patterns of brown, grey, and ochre, providing excellent camouflage.

Larvae (caterpillars) are typically brownish-green with darker markings along the dorsal side, which allows them to blend in seamlessly with raspberry canes.

The pupae are dark and reside within loose cocoons, usually concealed among dead foliage or within the top layer of the soil.

The adults are nocturnal; during the day, they remain motionless, resting with their wings folded in a tent-like fashion to avoid detection by predators.

The primary hosts for the larvae of this species are plants of the Rubus genus, particularly raspberries and blackberries.

Caterpillars cause damage by feeding on the leaves, starting from the edges and progressing to skeletonization, leaving only the primary veins intact.

Severe infestations can lead to the consumption of young developing buds and flowers, significantly impacting the potential berry yield.

Stunted growth of new canes is often observed following intensive feeding, which weakens the plant's structural integrity for the following season.

The feeding sites act as entry points for various pathogens, potentially increasing the incidence of fungal diseases in the raspberry plantation.

The flight period for the first generation of adults typically occurs from late May through June, depending on local weather conditions.

Females lay eggs on the undersides of leaves, and the emerging larvae begin their feeding cycle shortly thereafter.

The peak activity of the larvae usually coincides with the mid-summer months, corresponding to the period of maximum vegetative growth for raspberry canes.

Depending on the latitude and temperature, the moth may produce one or two generations per year, requiring ongoing monitoring throughout the growing season.

The species overwinters in the pupal stage, buried in the soil or protected by leaf litter, awaiting the onset of spring warmth.

The most noticeable sign of an infestation is the irregular, jagged damage to the leaf margins of raspberry plants.

Visible frass (caterpillar droppings) on the leaves below the feeding area is a strong indicator of the presence of larvae in the canopy.

Leaves that are partially folded or webbed together often indicate that the caterpillars are creating a shelter for molting or pupation.

Observing the plants after dusk with a flashlight often reveals the caterpillars actively feeding on the foliage.

Progressive defoliation of the lower or mid-section of the bushes, combined with wilting of damaged leaves, highlights significant pest pressure.

Cultural control measures, such as deep cultivation and soil disturbance in late autumn or early spring, can destroy overwintering pupae in the soil.

Maintaining a clean plantation by removing weeds and debris reduces the available hiding spots for the larvae and improves air circulation.

• Hand-picking caterpillars from infested plants during the early stages of an outbreak.
• Encouraging natural predators, such as birds and parasitic wasps, that help keep populations in check.
• Applying biological insecticides containing Bacillus thuringiensis for environmentally friendly caterpillar management.
• Using targeted chemical insecticides only when damage exceeds economic thresholds, while strictly following safety harvest intervals.
• Implementing regular monitoring and scouting to detect early signs of egg-laying or larval emergence.

Integrated pest management is the most effective approach to handle the Buff Arches moth, focusing on minimizing chemical reliance while ensuring crop health.