. Bulletin of the Department of Agriculture, Trinidad and Tobago. Plants -- Trinidad and Tobago; Agriculture -- Trinidad and Tobago. ] CONTROL OF THE CACAO THBIPS. SUMMARY OF LIFE HISTORY. 8S Eggs are laid by the female (fig. 1) in the tissues of young leaves ,' they hatch in about 3 to 4 days. In the case of cacao the female lays also in the skhi of pods that are nearly mature. The young larvffi (fig. 2) take about 9 days to complete their growth and then turn into prepupa? (fig. 3), this stage lasts 24 hours and is followed by the pupal stage (fig. 4) which is completed in 4S hours whe
. Bulletin of the Department of Agriculture, Trinidad and Tobago. Plants -- Trinidad and Tobago; Agriculture -- Trinidad and Tobago. ] CONTROL OF THE CACAO THBIPS. SUMMARY OF LIFE HISTORY. 8S Eggs are laid by the female (fig. 1) in the tissues of young leaves ,' they hatch in about 3 to 4 days. In the case of cacao the female lays also in the skhi of pods that are nearly mature. The young larvffi (fig. 2) take about 9 days to complete their growth and then turn into prepupa? (fig. 3), this stage lasts 24 hours and is followed by the pupal stage (fig. 4) which is completed in 4S hours when adults Fig. 2. Pg. 4-. Fig. 2.—Larval or young stage of thrijjs. The natural size about the same as the adult insect when the larva is full grown. Greatly en- larged. Colour light yellow, dark bands shown on draw- ing are red. Kedrawn from Russell. Fig. 3.—Piepupalstago. Greatly enlaiged. Colour and size more or less like larva with red bands. Ke- drawn from Paissell. Fig. 4.—Pupal stage- Greatly enlarged. Colour and size more or less like larva with red bands. Ke- drawn from Russell. The total period of development amounts to 12 days from the hatching of the egg to the appearance of perfect insects. The female lays- eggs without pairing for several generations and males are not common, occurring only at certain seasons and then not in large numbers. The number of eggs a female can lay is estimated at about 50. The length of the life of a female has not been determined. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Trinidad and Tobago. Dept. of Agriculture. Trinidad : Dept. of Agriculture
Size: 1871px × 1335px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1900, bookcollectionbiodiversity, bookdecade1910
