Co-Authors:
Shtienberg, D., Department of Plant Pathology and Microbiology, The Hebrew University of Jerusalem, Faculty of Agriculture, PO Box 12, Rehovot, 76100, Israel
Dreishpoun, J., Ministry of Agriculture, Extension Service, Department of Plant Protection, Hakirya, Tel-Aviv, Israel
Abstract:
The effects of difenoconazole, tebuconazole (systemic fungicides) and maneb (a protectant fungicide) on Alternaria leaf spot (Alternaria macrospora) and on yields of Pima cotton were determined in five field trials conducted in 1989 and 1990. Disease-induced defoliation was calculated as the sum of weighted estimates of the disease severity of attached leaves and the proportion of shed leaves. In all trials, difenoconazole at a rate of 0.125 kg a.i. ha-1 and tebuconazole at 0.187 kg a.i. ha-1 suppressed disease to a significant extent (p≤0.05) relative to untreated plots, and differences in yield (15.6-39.0% increase) between treated and untreated plots were significant. Although maneb (at 2.0 kg a.i. ha-1) also suppressed disease significantly, in four of the trials the yield differences (6.3-26.0% increase) between treated and untreated plots were insignificant. In general, defoliation and yields did not differ significantly among the different fungicide treatments. The systemic fungicides exhibited some curative properties because of their effects in suppressing previous infections. © 1991 Butterworth-Heinemann Ltd.
תפריט נגישות
ניגודיות עדינה
מונוכרום
הדגשת קישורים
חסימת אנימציה
פונט קריא
סגור
איפוס הגדרות נגישות
להורדת מודול נגישות חינם
