Deposits of the mildew fungicide binapacryl on the leaves of apple trees of differing sizes after mist blower spraying

Abstract

Trials in 1975 and 1976 showed that deposit levels of the fungicide binapacryl, on the leaves of bush trees of Cox's Orange Pippin (Cox) after mist blower spraying, varied inversely with tree spread. Deposit levels were measured on young mildew‐susceptible leaves from a well‐sprayed zone around the periphery of the tree canopy at a height of 1.5 m. Low deposit levels in large, dense trees were associated with poor mildew control. Leaves from the smallest trees had deposit levels considerably greater than those found for larger trees (in another nearby orchard) which had adequate mildew control. Fungicide deposit levels on leaves from up to five different zones of trees of three different sizes (the largest trees were of the variety Bramley's Seedling) were measured in 1977. The smallest trees had significantly higher deposit levels than the larger trees in the lower centre and lower outside zones of the trees, whereas both orchards of Cox had the same (commercially acceptable) level of mildew infection at the end of the season. Leaves from zones less accessible to spray had lowerdeposit levels than those nearer the sprayer.

Estimation of leaf area by mobile application: Fast and accurate method

“…It helps the researchers to understand and establish the inter-relationship among the growth of plants, production, irrigation requirement and leaf area. Meanwhile, it also effects the pesticide application rate on the plant canopy in the form of spray deposition, ground loss, drift, penetration of spray droplet and uniformity of distribution (Warman et al, 1981;Matthews, 1993;Ade, et al, 2007) [1][2][3] . Therefore, a fast and accurate measurement of the leaf area (LA) is required.…”