a study was carried out to determine whether naturally-occurring weeds and other cultivated plants in tomato growing regions could act as symptomless reservoirs of infection to fusarium oxysporum f. sp. lycopersici. a numher of f. oxysporum isolates from weeds and oubergines were used in this investigation. a susceptible tomato cultivar was used for comparison. the plants were artificially ...

Tomato leaves were detached and stored at 0 C for various periods of time. Chloroplasts were isolated from the leaves and their photoreductive activities were determined. Comparisons were made between two altitudinal forms of the wild tomato Lycopersicon hirsutum Humb. and Bonpl. (a tropical lowlands form and a highlands form adapted to growth at 3,100 meters), and two cultivars of the domestic...

Sequences homologous to a potato cathepsin D inhibitor cDNA, p749, were identified in the genomic DNA of tomato (Lycopersicon esculentum) and of two non-tuber-bearing potato species (Solanum etuberosum and S. brevidens) by means of Southern blot analysis. The expression of these p749 genes in leaves was induced at the RNA level in response to wounding. High levels of p749 transcripts were detec...

Herbivory induces plant defenses. These responses are often costly, yet enable plants under attack to reach a higher fitness than they would have reached without these defenses. Spider mites (Tetranychus ssp.) are polyphagous plant-pests. While most strains of the species Tetranychus urticae induce defenses at the expense of their performance, the species Tetranychus evansi suppresses plant def...

KOSTOV, K., R. BATCHVAROVA and S. SLAVOV, 2007. Application of chemical mutagenesis to increase the resistance of tomato to Orobanche ramosa L. Bulg. J. Agric. Sci., 13: 505-513 In this study chemical mutagenesis of tomato seeds with Ethylmethanesulfonate was used to obtain lines with increased resistance to Orobanche ramosa L. The M2 progeny of the mutant tomato plants was screened for the res...

Peroxyacetic acid mixture Perosan, composed of peroxyacetic acid, hydrogen peroxide and acetic acid, was evaluated for eco-friendly management of tomato bacterial wilt by Ralstonia pseudosolanacearum. Perosan drastically suppressed in vitro growth of R. pseudosolanacearum in liquid cultures in dose- and incubation time-dependent manners. Higher perosan doses (0.1 and 1%) caused lowered pH and p...

The aim of this study was to investigate whether and to what extent oxidative stress is induced in leaves of one- and two-month-old plants of Asparagus officinalis L. cv. Argenteuil infested by Brachycorynella asparagi (Mordvilko) at a varied population size. The pest B. asparagi has been described as the most damaging species feeding on asparagus. Analyses using electron paramagnetic resonance...

The life cycles of two plant species in the Mediterranean chaparral, the evergreen Arbutus andrachne and the deciduous Rhamnus lycioides, were studied, as were the cycles of two stenophagous whitefly species that live on them, Trialeurodes lauri and Dialeurolobus rhamni, respectively. Trialeurodes lauri is univoltine, diapausing from June to March corresponding to the plant’s leaf dormancy. The...

Abstract Background The tomato psyllid, Bactericera cockerelli Šulc (Hemiptera: Triozidae), is a pest of solanaceous crops such as ( Solanum lycopersicum L.) in the U.S. and vectors disease-causing pathogen ‘ Candidatus Liberibacter solanacearum’. Currently, only effective strategies for controlling diseases associated with this involve regular pesticide applications to manage psyllid populatio...

Microplot experiments were conducted over two years (four growing seasons) to evaluate Meloidogyne incognita resistance in rootstocks used for grafted tomato (Solanum lycopersicum), muskmelon (Cucumis melo), and watermelon (Citrullus lanatus). Three tomato rootstocks; 'TX301', 'Multifort', and 'Aloha', were tested in addition to the nongrafted scion, 'Florida-47'. Two muskmelon rootstocks; Cucu...