Incidence of fungal leaf diseases and phytophagous mites in different strawberry cultivars
Lithuanian Institute of Horticulture, Babtai, Kaunas distr., LT-54333,Lithuania; e-mail: n.uselis@lsdi.lt
Abstract:
The incidence of fungal leaf diseases, phytophagous mites and productivity of strawberry cultivars ‘Saulenė’, ‘Honeoye’, ‘Kent’, ‘Elkat’, ‘Polka’, ‘Dangė’, ‘Senga Sengana’, ‘Pegasus’, ‘Bogota’ and ‘Pandora’ was investigated in 2004–2005 under field conditions at the Lithuanian Institute of Horticulture.The lowest incidence by common leaf spot (Mycosphaerella fragariae (Tul.) Sacc) wasrecorded on Dangė’, ‘Elkat’ and ‘Pegasus’. Disease prevalence ranged on average from 43–46 % and disease intensity from 14–15.7%. The most common white leaf spot was on ‘Honeyoe’ and ‘Senga Sengana’. ‘Elkat’ and ‘Polka’ were the most damaged (disease prevalence was 68–69% and intensity 36–46%) by leaf scorch (Marssonina potentilae Desm. Magn.), while the lowest incidence of leaf scorch was recorded on ‘Bogota’. The incidence of diseases varied depending on meteorological conditions during 2004–2005.The lowest infestation by strawberry mite (Tarsonemus pallidus Banks.) was recorded on‘Bogota’ and ‘Kent’. Moderately infested were ‘Honeoye’, ‘Saulenė’,‘Pandora’, ‘Senga Sengana’ and highly infested, ‘Pegasus’. Low infestation by two-spotted spider mites (Tetranychus urticae Koch) were ‘Bogota’, ‘Pandora’ and ‘Saulenė’, moderately – ‘Kent’ and ‘Honeoye’; the most common two-spotted spider mites were found on ‘Pegasus’.The study showed that ‘Saulenė’, ‘Pandora’, ‘Senga Sengana’, ‘Honeoye’, ‘Polka’,‘Elkat’ and ‘Dangė’ were highly productive, ranging from 11 to 17 t ha-1. The productivity of ‘Pegasus’ was 9 t ha-1. Cultivars ‘Bogota’ and ‘Kent’ were averagely productive (6 – 7 t ha-1) .
Key words:
cultivars, Marssonina potentilae, Mycosphaerella fragariae, productivity, strawberry, Tarsonemus pallidus, Tetranychus urticae