A Specific High Toxicity of Xinjunan (Dioctyldiethylenetriamine) to by Affecting the Iron Metabolism.

spp. encompass a wide range of phytopathogens that brings great economic losses to various crops. Rational use of pesticides is one of the effective means to control the diseases.

Vegetative Compatibility of Fusarium graminearum Isolates and Genetic Study on Their Carbendazim-Resistance Recombination in China.

ABSTRACT Monoconidial isolates of 33 carbendazim-sensitive isolates and 31 carbendazim-resistant isolates of Fusarium graminearum were selected from three regions of China for vegetative compatibility group (VCG) analysis. A total of 213 and 224 nit mutants were recovered from the 33 sensitive and the 31 resistant isolates, respectively. Of all the nit mutants, the frequency of the different phenotypes was 44.

Flumorph Is a Novel Fungicide That Disrupts Microfilament Organization in Phytophthora melonis.

ABSTRACT The mechanism of the effects of flumorph (a novel fungicide) was investigated by analyzing alterations of hyphal morphology, cell wall deposition patterns, F-actin organization, and other organelles in Phytophthora melonis. Calcofluor white staining suggested that flumorph did not inhibit the synthesis of cell wall materials, but disturbed the polar deposition of newly synthesized cell wall materials during cystospore germination and hyphal growth. After exposure to flumorph, zoospores were able to switch into cystospores accompanied with the formation of a cell wall, whereas cystospores failed to induce the isotropic-polar switch and did not produce germ tubes but continued the isotropic growth phase.

[Induction and genetic analysis of laboratory mutants of Gibberella zeae resistance to carbendazim].

The mutants of wild-type Gibberella zeae resistance to carbendazim were generated in laboratory by ultra-violet (UV) irradiating and fungicide taming. Two levels of resistance (low, LR; high, HR) were identified among these mutants. LR mutants could grow at the critical concentration of 1.

[Genetics of resistance to carbendazim in Gibberella zeae].

According to the ability of the field isolates of Gibberella zeae to grow on the PSA with varying carbendazim(MBC) concentrations, three sensitivity levels of isolates were determined in vitro. The sensitive isolates(S) could grow at 0.5 microgram/ml, but were completely inhibited at 1.