Chemical control of soybean rust (Phakopsora pachyrhizi)

Chemical control of soybean rust (Phakopsora pachyrhizi)

Vicosa, Minas Gerais Universidade Federal de Vicosa Brazil

1982

xiv, 69p.

M.Sc.

SB608.S7J6

Systemic (benomyl, triforine and triadimefon) and nonsystemic fungicides (maneb, chlorothalonil and cooper) were tested for their control of soybean rust under greenhouse conditions. The uptake of the systemic fungicides by roots and their translocation in plants were studied using biological tests and the bioautograph technique. Triforine and triadimefon showed better curative effect than benomyl, however they did not differ in persistence on the plant. Triforine and triadimefon were translocated among and within the leaflets, and from roots to the leaves. The upward translocation of benomyl and triadimefon was detected only by the bioautograph technique. This technique also detected fungitoxic compounds derived from the soybean seeds treated with benomyl and triadimefon for 30 days after seeding. Maneb gave the best control of Phakopsora pachyrhizi among the nonsystemic fungicides. The phytotoxicity tests carried out under field conditions showed reduction in plant height and reduction in the number of pods per plant by triadimefon (1.5 kg/ha) and maneb (3 kg/ha) respectively. [AS]

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