. Bulletin of the Department of Agriculture, Trinidad and Tobago. Plants -- Trinidad and Tobago; Agriculture -- Trinidad and Tobago. 94 TBINIDAD AND TOBAGO BULLETIN. [XVIIL 2. secured in the bamboo rod and that it does not turn when the fittings are being screwed up. The length of a rod should not exceed 12 feet for average spraying on cacao estates. Longer rods are very fatiguing to the labourer and when the trees are very tall it is better to use ladders as is sometimes done for pruning or climb the trees. Stopcocks are very important, a simple and reliable one is repre- sented in fig. 8. Th
. Bulletin of the Department of Agriculture, Trinidad and Tobago. Plants -- Trinidad and Tobago; Agriculture -- Trinidad and Tobago. 94 TBINIDAD AND TOBAGO BULLETIN. [XVIIL 2. secured in the bamboo rod and that it does not turn when the fittings are being screwed up. The length of a rod should not exceed 12 feet for average spraying on cacao estates. Longer rods are very fatiguing to the labourer and when the trees are very tall it is better to use ladders as is sometimes done for pruning or climb the trees. Stopcocks are very important, a simple and reliable one is repre- sented in fig. 8. The use of a stopcock saves spraying mixture when moving from tree to tree. An angle nozzle (fig. 9) is the best kind for directing the spray to the underside of leaves where most of the thrips occur. The hole in the disc should not exceed -^^ inch in diameter ; after long use the hole is apt to wear larger, when a new disc must be substituted. Fig. 15 represents a useful pair of pliers to have in connection with spraying ; a shifting spanner is also useful. SPRAYING MIXTURES. Thrips are killed by a contact insecticide, which means that only those insects will be killed which are wetted by the liquid. Sometimes it is advisable to use a combined spray mixture which will act as a fungicide a fungus killer and an insecticide an insect killer as well; in connection with cacao and thrips a mixture of Bordeaux and Blackleaf 40 or Kicotine sulphate has always given very good results. Bordeaux mixture kills moss on the trees and prevents black rot and canker, and Blackleaf 40 kills thrips and other insects. Bordeaux Mixture. To make 50 gallons Bordeaux mixture the following ingredients are required:—(see fig. 16).. rig. 16. Fig l(i.—Method of niixiiij; Bordeaux. Redrawn from Korer. Copper sulphate or bluestone—5 pounds ; Temper lime, in lumps not in powder —5 pounds; Watir—40 Imperial gallons or 50 American Please note that these images are extracted from sc
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