Portal de Periódicos da CAPES

Seasonal Response of Woody Plants to Tebuthiuron Pellets

1985; Cambridge University Press; Volume: 33; Issue: 4 Linguagem: Inglês

10.1017/s0043174500082825

1550-2759

R. W. Bovey, Robert E. Meyer, L. F. Bouse, J. B. Carlton,

Horticultural and Viticultural Research

Pelleted tebuthiuron { N -[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]- N,N ′-dimethylurea} was hand broadcast at 2.2 and 4.5 kg ai/ha every month for 2 yr on an area infested with live oak ( Quercus virginiana Mill. ♯ 4 QUEVI), post oak ( Q. stellata Wangenh. ♯ QUESL), parsley hawthorn ( Crataegus marshallii Egglest. ♯ CSCMS), and yaupon ( Ilex vomitoria Ait. ♯ ILEVO) on the Gulf Coast Prairie near Cordele, TX. Live oak, post oak, and parsley hawthorn trees were killed at most rates and dates of tebuthiuron application. Applications of 2.2 kg/ha of tebuthiuron killed 90% or more of the yaupon plants when it was applied in October and December 1975 and February, March, and June 1976 and less than 90% when applied at other dates. On another site, pelleted tebuthiuron was aerially applied at 2.2 and 4.5 kg/ha every 3 months during 1978 and 1979 in the Post Oak Savannah near Bryan, TX. At 2.2 kg/ha, tebuthiuron killed all post oak and 80% or more of the blackjack oak ( Q. marilandica Muechh.), yaupon, winged elm ( Ulmus alata Michx. ♯ ULMAL), and mockernut hickory ( Carya tomentosa Nutt.) regardless of date treated. Tree huckleberry ( Vaccinium arboreum Marsh.) killed by tebuthiuron when applied at 2.2 kg/ha ranged from 34% in July 1979 to 69% from application in February 1978. Application of 4.5 kg/ha of tebuthiuron killed 83% or more of the tree huckleberry when it was applied in January and April 1978 and January, April, July, and October 1979. Herbaceous plant cover usually increased by the second season.