Tag Archives: strawberry

317-322 L. Raudonis
Comparative toxicity of spirodiclofen and lambdacihalotrin to Tetranychus urticae, Tarsonemus pallidus and predatory mite Amblyseius andersoni in a strawberry site under field conditions
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Comparative toxicity of spirodiclofen and lambdacihalotrin to Tetranychus urticae, Tarsonemus pallidus and predatory mite Amblyseius andersoni in a strawberry site under field conditions

L. Raudonis

Laboratory of Plant Protection, Lithuanian Institute of Horticulture,LT-54333 Babtai, Kaunas distr., Lithuania;e-mail: l.raudonis@lsdi.lt

Abstract:

The relative toxicity of broad-spectrum acaricide spirodiclofen 240 g AI l-1 from a new class of active ingredients and synthetic pyrethroid insecticide–acaricide lambdacihalotrin 50 g AI l-1 to the seasonal abundance of Tetranychus urticae Koch (Acari: Tetranychidae), Tarsonemus pallidus Banks (Acari: Tarsonemidae) and predatory mite Amblyseius andersoni Chant (Acari: Phytoseiidae) was evaluated in strawberry sites under field conditions in 2003–2004. The field rate (96 g AI ha-1) of spirodiclofen was very toxic (82.3–96.1% mortality) after 7 and 21 days after treatment to T. urticae. The mortality to T. pallidus ranged from 76.6- 79.3% after 7 days, and from 59.0–74.9% after 21 days following treatment respectively. The rate (48 g AI ha-1) of spirodiclofen was very toxic (78.8–87.8% mortality) after 7 days and moderately toxic (54.1–73.4% mortality) after 21 days following treatment to T. urticae. The lower rate of spirodiclofen was moderately toxic after 7 days and from non- to slightly toxic after 21 days following treatment to T. pallidus. The toxicity of lambdacihalotrin (25 g AI ha-1) to T. urticae was similar to a lower rate of Spirodiclofen. Lambdacihalotrin was non-toxic to T. pallidus, but moderately toxic (51.4–62.5% mortality) after 7 and 21 days following treatment to A. andersoni. Both rates of spirodiclofen were non-toxic to predatory mites.

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421-425 N. Uselis, A. Valiuškaitė and L. Raudonis
Incidence of fungal leaf diseases and phytophagous mites in different strawberry cultivars
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Incidence of fungal leaf diseases and phytophagous mites in different strawberry cultivars

N. Uselis, A. Valiuškaitė and L. Raudonis

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) .

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45–48 K. Kahu
Use of Basta 150 SL in strawberries
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Use of Basta 150 SL in strawberries

K. Kahu

Polli Horticultural Institute of the Estonian Agricultural University, 69104 Karksi-Nuia, Estonia, e-mail: kersti@pai.neti.ee

Abstract:

The experiment was carried out in the strawberry plantations of the Polli Horticultural Institute during two years, 2000–2001. ‘Bounty’ was the strawberry cultivar studied. The objective of the experiment was to evaluate the effectiveness of herbicide Basta 150 SL for problematic weeds and strawberry daughter plants. The strawberry plants were set in spring 1999, using  black plastic mulch. In the experiment, the plot size was 30 m2 (2 x 15 m) and planting scheme 1.2 x 0.3 m. The following treatment variants were used: 1. Untreated (control); 2. Basta 150 SL 3l/ha; 3. Basta 150 SL 5l/ha. Each variant was represented with 4 replications. The herbicide was applied twice by means of  a backpack sprayer: in May before  blooming and in August when new weeds had grown. The results of the experiment indicated that due to Basta 150 SL weed infestation in strawberry plantation was decreased. It was noted that, in both treatment variants, Basta 150 SL destroyed nearly 90–96% of strawberry daughter plants. The results also showed that Basta 150 SL did not cause damage to strawberry plants and berries. The herbicide applied in two doses (5 l/ha and 3 l/ha) did not affect the strawberry yield negatively. It was established that in both treatment variants yields were  increased by 26.9 and 29.2%, respectively. We noted that it was practical to use Basta 150 SL at the rate of 5 l/ha  only in the case of appearing perennial weeds (Taraxacum officinalis, Cirsium arvense, Viola arvensis) in an orchard. For other weeds, the rate of herbicide 3 l/ha suited well.

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