The effect of cartap hydrochloride (cartap HCI; Padan(R)) on soil microflora was examined under laboratory conditions. Cartap HCl at 10 ppm (a normal application) and 100 ppm treatments had no appreciable influence on the populations of fungi, actinomycetes, aerobic and anaerobic bacteria under upland and flooded conditions. However, the populations of the microorganisms were decreased by treatment at 1,000 ppm of the chemical under both conditions. Fungal and actinomycete populations were less in soil treated at 1,000 ppm than in untreated soil during 60 days. The numbers of aerobic and anaerobic bacteria at 1,000 ppm of the chemical under both conditions decreased for the first 3 and 15 days, respectively, but subsequently recovered. Fungal flora was not affected by 10 and 100 ppm treatments under either condition, but the fungal composition was changed by 1,000 ppm treatment under upland conditions, namely, the rate of Penicillium spp. in total fungi decreased, while those of Trichoderma spp. and Fusarium spp. increased. Under flooded conditions, even treatment at 1,000 ppm made little or no remarkable change on the fungal flora.
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