. Recent research on foliage diseases : conference proceedings : Carlisle, Pennsylvania, May 29-June 2, 1989. Leaves Diseases and pests United States Congresses. I ! 1986 Treatments: ⢠-Check kg a-iiha 6 June, 20 Aug., 9 Oct 1985 + 24 March 1986. â kg 6 June 1985 * kg 24 Marcni98S. SarrtDling aates: 5 March,. 24 Marcn. 12 June 1986. 100 1987 1988 Treatments: ⢠-Checx kg aJ-/ha 8 June, 18 Aug., 14 Oct 1987 + 23 March, 10 May 1988. â kg a_iJha 8 June 1987 + 2-3 kg aJVha 10 May 1988. Samoling oatss: 8 June. 18 Aug., 14 Oct, 7 Dec. 1987, and 2 Feb., 2
. Recent research on foliage diseases : conference proceedings : Carlisle, Pennsylvania, May 29-June 2, 1989. Leaves Diseases and pests United States Congresses. I ! 1986 Treatments: ⢠-Check kg a-iiha 6 June, 20 Aug., 9 Oct 1985 + 24 March 1986. â kg 6 June 1985 * kg 24 Marcni98S. SarrtDling aates: 5 March,. 24 Marcn. 12 June 1986. 100 1987 1988 Treatments: ⢠-Checx kg aJ-/ha 8 June, 18 Aug., 14 Oct 1987 + 23 March, 10 May 1988. â kg a_iJha 8 June 1987 + 2-3 kg aJVha 10 May 1988. Samoling oatss: 8 June. 18 Aug., 14 Oct, 7 Dec. 1987, and 2 Feb., 23 March. 10 May, 10 June 1988. Figure 4.âPercentages of the 1985 complement of Pinus sytvestris needles infected by Cyclaneusma minus fol- lowing various treatments with chlorothalonil during 1985/86. Figure 5.âPercentages of the 1987 complement of Pinus syivestris needles infected by Cyclaneusma minus fol- lowing various treatments with chlorothalonil during 1987/88. during the spring infection period when warm tempera- tures, frequent spring rains, and high inoculum pressure are common. The kg spring spray in Study 1 maintained protection from 9 April through 12 July. In Study 2, this spray was applied earlier, on 24 March, and the chemical probably deteriorated during May when inoculum pressure peaked and protection was crucial. Thus, Study 2 treatments showed that one spring applica- tion at either or kg was not sufficient to provide protection during the spring infection period. Study 3.âIn Study 2, either 3 sprays at kg applied in June, August and October, or a single applica- tion at kg in June prevented infection through- out the summer, fall, and winter. Study 3 replicated the summer and fall spray applications of Study 2, but evalu- ated the addition of a second kg spring applica- tion to control the spring infection period. Thus, five kg rate sprays were applied in Study 3 â June, A
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