Monocrotophos residue levels in coconut leaves, kernel and water
2010
Ma, C.K. | Lim, K. P. | A. Sivapragasam | Mohd Jusoh M. | Razali B. | Ayub Din
The residue level of injected monocrotophos in coconut (var. MATAG; 3 year old) leaves, kernel and water was determined in a supervised study. The treatments were an untreated check; a single application of monocrotophos (Azodrin® 60WSE 55% a.i) at 10ml/palm (recommended rate) and 20 ml/palm. Generally leaves recorded the highest residue levels amongst the samples tested. In the leaves, residue levels exceeded MRL (0.05 ppm) at all the sampling dates commencing from day 4 days after treatment (DAT) until 77 DAT. The residue level was higher with increased application rate. In the kernel, detectable levels of monocrotophos were seen beginning 7 DAT. At the recommended rate the MRL was exceeded at 7, 28, 43 and 49 DAT, after which it was not detectable. In the 20 ml/palm treatment, the pesticide was detectable even until 77 DAT. In the coconut water, generally, residue levels in the water were higher than the kernel. As in the kernel, monocrotophos residues applied at recommended rate were detected at 7 DAT. MRL was exceeded at 7, 22, 28, 35, 43 and 49 DAT. After that, there were still residues of monocrotophos present in the water, but the levels were below the MRL. On the other hand, high levels of monocrotophos were detected in the water in the 20 ml/palm treatment until 77 DAT. The results indicated that even at the recommended rate (10 ml/palm), residues of monocrotophos were above the MRL until 49 DAT in the kernel and water of young tender coconut and until 77 DA T if applied at higher rate (20 ml/palm). Considering the relatively high residue in the edible components of the young nut, and the levels and distribution in the leaves can be help towards managing leaf feeding insect pests, it is recommended that the use of monocrotophos for trunk injection be limited to only palms in the immature stage.
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