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Spotted Tentiform Miner, Phyllonorycter blancardella

Phyllonorycter blancardella, Spotted tentiform miner is a damaging insect of apple and pear.

The synonym is Lithocolletis blancardella. The other common name of this insect is Blotch miner. The species is commonly distributed in France, England and Wales, Scotland, Ireland and other parts of Europe.

Russell IPM manufactures and supplies pheromone lures, traps and complete monitoring systems for Phyllonorycter blancardella, Spotted tentiform miner. Pheromone trap data gives early warning of the infestation and also exhibits the density of the insect population.

Biology

Adult wingspan is 7-9 mm. The fore wings narrow and golden brown, with large yellowish belt, hind wings are very narrow with wide outer edge. Larvae are 6 to 8 mm long. The larva lives as a miner on the upper surface of the leaf. The larvae pupate in the leaf. Three to four generations are occurs with in a year. The adults emerge started in May, June and August.

Nature of Damage

The larvae feed on the leaves of apple. The larva lives as a miner on the upper surface of the leaf and creates mine between two veins of leaf. The mine is oval, swollen and covered with small grey spots. On the underside of the leaf, the epidermis is brownish and wrinkled. The frass is grouped in the central area of the mine, amongst small silken threads. Damage is visible in the form of whitish marks on upper surface on leaves (according to inra.fr).

Monitoring

Russell IPM manufactures and supplies pheromone lure – the Qlure, traps and complete monitoring systems for Phyllonorycter blancardella, Spotted tentiform miner.

Pheromone trap data gives early warning of the infestation and will also alert the user to a low level of population before it becomes serious.

The lure can be best applied with the Mothcatcher trap or Delta trap.

Application Guidelines

Lures
Lures can be changed every 4-6 weeks to get the most accurate results.

Lures handling
Pheromone lures are a very sensitive tool. They can be affected by exposure to elevated heat and direct sunshine. Direct touching by hand may cause cross contamination leading to mixed catches in the trap. Some contaminants such as Nicotine May have repellent effect reducing trap catch.

Lure Storage

Store in a cool dry place. Shelf life can vary from 3-36 months depending on the storage temperature. See Technical Data Sheet for further details.

Trap Selection

The Deltra trap is the most sensitive trap to use for monitoring this insect. However, Moth catcher may be used in dusty conditions or in high moth population density.

Trap Density

Do not re-use the trap to monitor different insects as this may lead to mixed catches. One trap for every two hectares of large scale fields of homogenous lands.

Two traps per hectare (2trap/ha) for small holdings and in field of uneven topography.

Trap Position

Place traps near the highest point of the plant using supporting posts approximately 1 meter high, or higher if the crop is higher.

Data and Interpretation

Collect data weekly from the start of the flight of the over wintering generation. During the height of the population more frequent reading may be needed. Decisions on pesticide application should not be taken solely on the trap catch data. Climatic and biological considerations should be taken in account.

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