Botrytis cinerea causes the gray molds or gray mold of fruits and vegetables, both in the field a... more Botrytis cinerea causes the gray molds or gray mold of fruits and vegetables, both in the field and in storage. Almost all fresh fruits, vegetables, and bulbs are attacked by B. cinerea in storage (Agrios, 1997). In wine production, their most serious damage is qualitative, from the modified chemical composition of diseased berries. The fungus converts simple sugar (glucose and fructose) to glycerol and gluconic acid and produces enzymes that catalyze the oxidation of phenolic compounds. It also secretes polysaccharides such as -glucan, which hinder the clarification of wine. Wine produced from rotten grape fruits has off-flavors and is fragile and sensitive to oxidation and bacterial contamination, making them unsuitable for aging (Jarvis, 1977, McClellan and Hewitt, 1973). The use of synthetic chemicals to control plant diseases is restricted due to their possible carcinogenicity, acute toxicity, long degradation periods, environmental pollution and their effects on human beings (...
Because of the potential importance of peptaibols in the biological control of plant diseases, a ... more Because of the potential importance of peptaibols in the biological control of plant diseases, a transgenic, a T. reesei strain carrying a tex1-promoter: goxA fusion plasmid was constructed for furthur studies. The peptaibol synthetase gene (which is highly similar to T. virens tex1) was identified in the genome sequence of T. reesei. A 900 bp 5’ upstream noncoding fragment, presumed to include the promoter region of tex1, was cloned into the pSJ3 plasmid (which contains the Aspergillus niger goxA gene encoding glucose oxidase). Finally, we transformed T. reesei with the tex1-promoter: goxA fusion containing pSJ3 plasmid.
A study of fungi responsible for severe leaf spots of common milkweed (Asclepias syriaca L.) in t... more A study of fungi responsible for severe leaf spots of common milkweed (Asclepias syriaca L.) in the Hajdúság region (East Hungary), Fusarium sporotrichioides and Alternaria alternata were isolated from infested leaf tissues. F. sporotrichioides was the most virulent fungus in pathogenicity tests conducted on healthy leaves of common milkweed plants. Inoculation of common milkweed (A. syriaca) in different growth stages with F. sporotrichioides yielded similar symptoms as the original ones. Spray mixtures containing 1.0×106 conidia/ml gave effective control when common milkweed plants were sprayed until runoff occurred. Laboratory (wet chamber) and field experiments showed that asexual spores of the fungal pathogen, F. sporotrichioides, exhibited bioherbicidal activity against common milkweed (A. syriaca). More efficient control efficacy was observable on elder plants (at flowering stage) than younger ones. These results initiate that this fungus may be a biocontrol agent for control...
Botrytis cinerea causes the gray molds or gray mold of fruits and vegetables, both in the field a... more Botrytis cinerea causes the gray molds or gray mold of fruits and vegetables, both in the field and in storage. Almost all fresh fruits, vegetables, and bulbs are attacked by B. cinerea in storage (Agrios, 1997). In wine production, their most serious damage is qualitative, from the modified chemical composition of diseased berries. The fungus converts simple sugar (glucose and fructose) to glycerol and gluconic acid and produces enzymes that catalyze the oxidation of phenolic compounds. It also secretes polysaccharides such as -glucan, which hinder the clarification of wine. Wine produced from rotten grape fruits has off-flavors and is fragile and sensitive to oxidation and bacterial contamination, making them unsuitable for aging (Jarvis, 1977, McClellan and Hewitt, 1973). The use of synthetic chemicals to control plant diseases is restricted due to their possible carcinogenicity, acute toxicity, long degradation periods, environmental pollution and their effects on human beings (...
Because of the potential importance of peptaibols in the biological control of plant diseases, a ... more Because of the potential importance of peptaibols in the biological control of plant diseases, a transgenic, a T. reesei strain carrying a tex1-promoter: goxA fusion plasmid was constructed for furthur studies. The peptaibol synthetase gene (which is highly similar to T. virens tex1) was identified in the genome sequence of T. reesei. A 900 bp 5’ upstream noncoding fragment, presumed to include the promoter region of tex1, was cloned into the pSJ3 plasmid (which contains the Aspergillus niger goxA gene encoding glucose oxidase). Finally, we transformed T. reesei with the tex1-promoter: goxA fusion containing pSJ3 plasmid.
A study of fungi responsible for severe leaf spots of common milkweed (Asclepias syriaca L.) in t... more A study of fungi responsible for severe leaf spots of common milkweed (Asclepias syriaca L.) in the Hajdúság region (East Hungary), Fusarium sporotrichioides and Alternaria alternata were isolated from infested leaf tissues. F. sporotrichioides was the most virulent fungus in pathogenicity tests conducted on healthy leaves of common milkweed plants. Inoculation of common milkweed (A. syriaca) in different growth stages with F. sporotrichioides yielded similar symptoms as the original ones. Spray mixtures containing 1.0×106 conidia/ml gave effective control when common milkweed plants were sprayed until runoff occurred. Laboratory (wet chamber) and field experiments showed that asexual spores of the fungal pathogen, F. sporotrichioides, exhibited bioherbicidal activity against common milkweed (A. syriaca). More efficient control efficacy was observable on elder plants (at flowering stage) than younger ones. These results initiate that this fungus may be a biocontrol agent for control...
There is few professional information on the rape stem weevil in Hungary. According to the most v... more There is few professional information on the rape stem weevil in Hungary. According to the most valuable entomological source in Hungary (Manual of the plant protection zoology) its damage is rare in Hungary. This paper summarises the most important information of the technical literature and shows the results of recent investigations on the occurrence and damage of C. napi in the north of Hungary. On the basis of these the rape stem weevil occurred commonly in the spring of 2007 in the fields of Újfehértó and Érpatak, its frequency was high in the rape. Regarding this experience and other Hungarian observations, Ceutorhynchus napi occurs commonly in Transfanubia and in the north of Hungary, consequently its damage can be frequent. Comparing the results of present paper with the information of the Hungarian entomological manuals, it seems to be worth following the presence and damage of C. napi in Hungary with attention because either the former information on the pest was based on few data or the rape stem weevil is spreading.
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Papers by Gyorgy Kovics
observations, Ceutorhynchus napi occurs commonly in Transfanubia and in the north of Hungary, consequently its damage can be frequent. Comparing the results of present paper with the information of the Hungarian entomological manuals, it seems to be worth following the presence and damage of C. napi in Hungary with attention because either the former information on the pest was based on few data or the rape stem weevil is spreading.