Lalitha Galanihe - Academia.edu (original) (raw)
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Papers by Lalitha Galanihe
![Research paper thumbnail of Host-finding behaviour of female apple leaf curling midge, Dasineura mali Kieffer (Diptera: Cecidomyiidae) : a thesis presented in partial fulfilment of the requirements for the degree of Masters [i.e. Master] of Applied Science in Plant Health at Massey University, Palmerston North, New Zealand](https://attachments.academia-assets.com/101402773/thumbnails/1.jpg)
](Massey University, 1996
I am extremely grateful to my supervisor Dr.Marion Harris for her constant encouragement, invalub... more I am extremely grateful to my supervisor Dr.Marion Harris for her constant encouragement, invaluble supervision and guidance throughout my programme of study, for being available and always willing to help solve my problems, for her moral support, kindness and patience which lead me along the path of success in this research project. I am also thankful to Dr. Stephen Foster for his suggestions and support provided whenever needed in conducting this study. My gratitude towards Prof. Kenneth Milne, Head, Department of Plant Science, Massey University for his valuble support throughout the period of my course of study and to Dr. Qiao Wang for his valuable comments and suggestions on an earlier draft of this thesis. I appreciated very much the excellent academic and technical support received from the staff of the
Journal of Chemical Ecology
The behavioral responses of apple leafcurling midge,Dasineura mali Kieffer, mated females to foli... more The behavioral responses of apple leafcurling midge,Dasineura mali Kieffer, mated females to foliage from host and nonhost trees were investigated in a wind tunnel. When released downwind of apple or pear foliage, females exposed to apple were more likely to exhibit upwind flight and to approach and land on foliage. On apple foliage, landings were concentrated on buds and immature leaves. Probability of taking flight and latency to flight did not differ for females exposed to apple and pear. When foliage was placed behind screens to obscure plant visual stimuli, females again distinguished between apple and pear, with more of the females exposed to apple odors flying upwind and landing. Females exposed to pear odors were more likely to fly upwind, approach, and land than females exposed to clean air. Odors from immature apple foliage triggered orientation responses in a larger percentage of females than odors from mature apple foliage. A dichloromethane extract of immature apple fol...
Annals of the Entomological Society of America, 1999
ABSTRACT The leafcurling midges Dasineura mali Kieffer collected as mature larvae in curled apple... more ABSTRACT The leafcurling midges Dasineura mali Kieffer collected as mature larvae in curled apple leaves were brought to the laboratory where they left leaves and pupated in boxes of soil. Two to 3 wk later, adult eclosion showed a diel periodicity, peak eclosion occurring between 0600 and 1000 hours. Within this period, peak male eclosion typically occurred 1-2.5 h earlier than peak female eclosion. For males, wing fanning, mating, and flight first occurred, on average, 30, 32, and 41 min after eclosion, respectively. For virgin females, calling behavior and mating first occurred, on average, 16 and 38 min after eclosion, respectively. Calling events were of variable duration (0.3-55 min) and occurred most frequently between 0900 and 1500 hours. Males mated many times, whereas females mated only once or twice. After mating, females sat for ≈1 h before taking their 1st flight. In a windtunnel, percentages of females taking-off, flying upwind, and exhibiting examining behaviors on apple leaves increased from the morning to the afternoon. In an apple orchard, traps placed below the canopy of trees caught more males than traps placed in the tree canopy. The relevance of this information for the isolation and identification of behaviorally active chemicals (i.e., pheromones and kairomones) is discussed.
Tropical Agricultural Research and Extension, 2010
A hitherto unrecorded species of mealybug was discovered in early 2008 in the western provincial ... more A hitherto unrecorded species of mealybug was discovered in early 2008 in the western provincial districts Colombo and Gampaha in Sri Lanka, infesting a large number of plant species. Investigations were done to identify the pest and to study its host range, nature of damage and distribution, and to design and implement control measures. The pest was identified as papaya mealybug, Paracoccus marginatus
Williams & Granara de Willink (Hemiptera: Pseudococcidae), an invasive alien species originating from Mexico and/or Central America. The mealybug found to heavily infest more than 40 plant species including papaw, the major host,and several horticultural and floricultural crops like Plumeria, manioc, bread fruit, Alstonia macrophylla and
Jatropha spp. By 2009 the pest had spread to other parts of the country including the North Western, Sabaragamuwa, Southern, North Central, Central and Eastern provinces. As an immediate control measure, imidacloprid 200SL, thiamethoxam 25%WG and Mineral oil were recommended for the control of this pest until biological control agents could be introduced.
Keywords
:
Papaya Mealybug, Paracoccus marginatus , Distribution, Host Range, Control
Tropical Agricultural Research and Extension, 2013
Massey University, 1996
I am extremely grateful to my supervisor Dr.Marion Harris for her constant encouragement, invalub... more I am extremely grateful to my supervisor Dr.Marion Harris for her constant encouragement, invaluble supervision and guidance throughout my programme of study, for being available and always willing to help solve my problems, for her moral support, kindness and patience which lead me along the path of success in this research project. I am also thankful to Dr. Stephen Foster for his suggestions and support provided whenever needed in conducting this study. My gratitude towards Prof. Kenneth Milne, Head, Department of Plant Science, Massey University for his valuble support throughout the period of my course of study and to Dr. Qiao Wang for his valuable comments and suggestions on an earlier draft of this thesis. I appreciated very much the excellent academic and technical support received from the staff of the
Journal of Chemical Ecology
The behavioral responses of apple leafcurling midge,Dasineura mali Kieffer, mated females to foli... more The behavioral responses of apple leafcurling midge,Dasineura mali Kieffer, mated females to foliage from host and nonhost trees were investigated in a wind tunnel. When released downwind of apple or pear foliage, females exposed to apple were more likely to exhibit upwind flight and to approach and land on foliage. On apple foliage, landings were concentrated on buds and immature leaves. Probability of taking flight and latency to flight did not differ for females exposed to apple and pear. When foliage was placed behind screens to obscure plant visual stimuli, females again distinguished between apple and pear, with more of the females exposed to apple odors flying upwind and landing. Females exposed to pear odors were more likely to fly upwind, approach, and land than females exposed to clean air. Odors from immature apple foliage triggered orientation responses in a larger percentage of females than odors from mature apple foliage. A dichloromethane extract of immature apple fol...
Annals of the Entomological Society of America, 1999
ABSTRACT The leafcurling midges Dasineura mali Kieffer collected as mature larvae in curled apple... more ABSTRACT The leafcurling midges Dasineura mali Kieffer collected as mature larvae in curled apple leaves were brought to the laboratory where they left leaves and pupated in boxes of soil. Two to 3 wk later, adult eclosion showed a diel periodicity, peak eclosion occurring between 0600 and 1000 hours. Within this period, peak male eclosion typically occurred 1-2.5 h earlier than peak female eclosion. For males, wing fanning, mating, and flight first occurred, on average, 30, 32, and 41 min after eclosion, respectively. For virgin females, calling behavior and mating first occurred, on average, 16 and 38 min after eclosion, respectively. Calling events were of variable duration (0.3-55 min) and occurred most frequently between 0900 and 1500 hours. Males mated many times, whereas females mated only once or twice. After mating, females sat for ≈1 h before taking their 1st flight. In a windtunnel, percentages of females taking-off, flying upwind, and exhibiting examining behaviors on apple leaves increased from the morning to the afternoon. In an apple orchard, traps placed below the canopy of trees caught more males than traps placed in the tree canopy. The relevance of this information for the isolation and identification of behaviorally active chemicals (i.e., pheromones and kairomones) is discussed.
Tropical Agricultural Research and Extension, 2010
A hitherto unrecorded species of mealybug was discovered in early 2008 in the western provincial ... more A hitherto unrecorded species of mealybug was discovered in early 2008 in the western provincial districts Colombo and Gampaha in Sri Lanka, infesting a large number of plant species. Investigations were done to identify the pest and to study its host range, nature of damage and distribution, and to design and implement control measures. The pest was identified as papaya mealybug, Paracoccus marginatus
Williams & Granara de Willink (Hemiptera: Pseudococcidae), an invasive alien species originating from Mexico and/or Central America. The mealybug found to heavily infest more than 40 plant species including papaw, the major host,and several horticultural and floricultural crops like Plumeria, manioc, bread fruit, Alstonia macrophylla and
Jatropha spp. By 2009 the pest had spread to other parts of the country including the North Western, Sabaragamuwa, Southern, North Central, Central and Eastern provinces. As an immediate control measure, imidacloprid 200SL, thiamethoxam 25%WG and Mineral oil were recommended for the control of this pest until biological control agents could be introduced.
Keywords
:
Papaya Mealybug, Paracoccus marginatus , Distribution, Host Range, Control
Tropical Agricultural Research and Extension, 2013