Application Of Iprodione Research Articles

Influence of energy-saving night temperature regimes on Botrytis cinerea in an early-season glasshouse tomato crop

Night minimum temperatures of 9°C and a regime with periods of one month at 16°C,and 5°C, followed by 13°C, were compared with a night regime of 13°C for their effects on Botrytis cinerea Pers. in an early-season glasshouse tomato crop. Day temperatures were the same in all treatments. Nine independent compartments were used in a randomized block design in which sub-plots were treated with or without a programme of fungicidal sprays of iprodione started at one of three stages in relation to the first infection by B. cinerea. The low-temperature regime of 9°C significantly increased numbers of lesions caused by B. cinerea on stems and leaves during April and May, but not in subsequent months. Increases during May and June of fallen fruits from 9°C plants were not statistically significant. Stem and leaf infections were not increased by the 16/5/13°C energy-saving regime, although losses due to fallen fruit were greater during May. Treatment with iprodione sprays caused significant decreases in disease in all night temperature regimes and was similar in effect to an increase in night temperature from 9°C to 13°C. Responses to the timing of the first application of iprodione were never significant and differed during the first month of disease assessment only. Yields were significantly lower in the first month of cropping at 9°C but there were no differences in yield between the 13°C and the 16/5/13°C regimes.

Efficacy of aerial application of benomyl and iprodione for the control of sclerotinia stem rot of canola (rapeseed) in central Alberta

Efficacy of aerial application of benomyl and iprodione for the control of sclerotinia stem rot of canola (rapeseed) in central Alberta

The effect of iprodione in granule or combined granule and stem‐base applications on white rot disease (Sclerotium cepivorum) of spring‐sown salad onions

SUMMARYIprodione, formulated as granules and placed in the seed furrow, was tested in field plots in Warwickshire for control of white rot (Sclerotium cepivorum Berk.) of spring‐sown salad onions. At 0.25 g iprodione/m row the granules were nearly as effective as seed treatment at 125 g iprodione/kg seed, which reduced infection in 1978 from 88 per cent plants infected to 13 per cent. At 0.063 or 0.125 g iprodione/m row, granules were less effective but gave control similar to that with calomel seed treatment at 500 g/kg, which reduced infection to 46 per cent.In 1979, excellent control was achieved by combining the pre‐planting granule treatment with a later application of iprodione to stem bases. Granules applied at 0.063 g iprodione/m row combined with a single post‐emergence stem‐base application of iprodione at 0.031 g/m row (equivalent to a total rate of 2.8 kg iprodione/ha) gave complete control of the disease.

The effect of iprodione on the seed‐borne phase of Alternaria brassicicola

SUMMARY Alternaria brassicicola infection of Brassica oleracea seeds was effectively controlled by a dust application of iprodione (Rovral 50% w.P.). At 2.5 g a.i./kg the seed‐borne fungus was usually eliminated from samples with up to 61.5% affected seeds (35.5% internally diseased) but higher levels of infection required increased doses for complete eradication of the fungus. The germination of healthy seeds, including samples from 7–yr‐old stocks, on filter paper was unaffected by the treatment. However, the germination of diseased samples, particularly those internally infected with A. brassicicola, was improved. More seedlings emerged from iprodione treated than from untreated seeds in glasshouse soil but the differences were not significant. The application of gamma‐hexachlorocyclohexane to iprodione treated seeds sown in soil did not adversely affect subsequent emergence or disease control. Disease control was maintained and germination was not affected by the treatment when treated infected seeds were stored for 2 yr at 10 °C, 50% r.h. In a field trial iprodione seed treatment reduced seedling infection in a cabbage crop grown from naturally diseased seeds (100% contaminated, 45.5% internally infected) from 5.6 to 0.04%.

Uptake of iprodione and control of diseases on potato stems

AbstractWhen applied to the roots of potato plants growing in different soils iprodione became systemic in the plants. Although iprodione was adsorbed on the soils tested, sufficient fungicide was present in potato stems to prevent infection by Phoma exigua var. foveata on all plants except those grown in peat soils. The amount of fungicide present in the aerial parts of the plant was related to the soil/water distribution coefficients. Application of iprodione to the sprouts of seed potato tubers prior to planting decreased the incidence and severity of infection by Rhizoctonia solani (stem canker) and Polyscytalum pustulans on stem bases.

Application of iprodione by thermal fogging for the control of grey mould of tomato

SUMMARYA ready‐to‐fog' formulation of iprodione applied with themal foging equipment was a satisfactory alternative to high‐volume (HV) sparys of iprodione for the control ofnatural infecton with grey mould (Botrytis cinerea) in an unheated tomato crop. There were no significant differences in numbers of droped fruit nor in the control of naturally‐occurring lesions in stems or leaves, nor of ghost‐spotting on fruit, between the HV sprays and fogs applied every fortnight. Except for ghost‐spotting, control by fogs applied weekly was better than by eihter for nightly treatment. In contrast, the control of infection from B.cinerea inoculations on peitoles was significantly better by the fortnightly HV treatment than by either frequency of foging. Control of infection imporved with increase in the number of fungicide applications to the peitole before inoculation; two HV sprays gave complete control but six fog applications did not. The variation in the conrrol of infection by fogs and presumbly therefore in the distribution of fungicide within the 61 m2 glasshouse compartments was small. Application of the iprodione fogging formulation significantly reduced the number of fruits see by about 5% compared with the HV treatment.