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THE EFFECT OF CHLORMEQUAT SEED‐PARENT TREATMENT ON THE RESISTANCE OF WHEAT SEEDLINGS TO TERBUTRYNE AND SIMAZINE
Author(s) -
PINTHUS MOSHE J.
Publication year - 1972
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1972.tb01213.x
Subject(s) - chlormequat , seedling , simazine , sowing , horticulture , biology , agronomy , chemistry , plant growth , pesticide , atrazine
Summary. The effects of pre‐sowing treatments with terbutryne (4‐ethylamino‐2‐ niethylthio‐6‐t‐butylamino‐1,3,5‐triazine) and with simazine (2‐chloro‐4,6‐bisethyl‐amino‐1,3,5‐triazine) on seedling mortality of wheat grown from regular seed and from seed containing about 40 ppm chlormequat (2‐chloroethyl trimethylammonium chloride), due to a late chlormequat treatment of the seed‐parent, were tested in two pot experiments. In another pot experiment the effects of pre‐sowing and post‐emergence treatments of terbutryne on dry matter accumulation and moisture content in SPT (= Seed‐Parent Treated) and regular wheat seedlings were examined. No significant differences in simazine resistance between regular and SPT seed were found. However, there was a marked and significant increase in terbutryne resistance of SPT over regular seeds, which was expressed by a longer period to 50% seedling mortality as well as by a lower daily increase in mortality. Growth retardation, caused by pre‐ sowing as well as by post‐emergence terbutryne treatments, was appreciably less in the SPT seedlings than in the regular ones. The higher terbutryne resistance of the SPT seedlings may be attributable to their higher moisture content induced by the chlormequat. Effet du traitement des pieds meres avec le chlorméquat sur la résistance des plantules de blé a la terbutryne et à la simazine