Editorial overview: Microbial manipulation of insect–parasite interactions

A note on the use of microbial insecticides for the control of tomato hornworms on flue-cured tobacco

Phytoprotection ◽

10.7202/705989ar ◽

2005 ◽

Vol 71 (2) ◽

pp. 101-103

Author(s):

H.H. Cheng ◽

J.J. Hanlon

Keyword(s):

Bacillus Thuringiensis ◽

Detrimental Effect ◽

Tobacco Plants ◽

Complete Control ◽

Insect Parasite ◽

Beneficial Insect

Two formulations of Bacillus thuringiensis, Bactospeine-A and Thuricide-HPC, were applied on tobacco plants after topping to evaluate their effectiveness against tomato hornworm (Manduca quinquemaculata) in the laboratory and field. Both materials, regardless of the rates applied, gave complete control of the tomato hornworms. All the larvae fed slightly or moderately on the treated leaves during the first day after treatment, but thereafter, the larvae remained inactive on the treated leaves until death. There was little evidence of further feeding when the leaves were examined. The microbial insecticides had no detrimental effect on the beneficial insect parasite, Cotesia congragata, and no phytotoxicity was observed.

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Nitrogen elimination in Trichoplusia ni parasitized by the insect parasite, Hyposoter exiguae

Comparative Biochemistry and Physiology Part A Physiology ◽

10.1016/0300-9629(84)90634-0 ◽

1984 ◽

Vol 78 (4) ◽

pp. 785-786 ◽

Cited By ~ 16

Author(s):

S.N Thompson ◽

A.C Cohen

Keyword(s):

Trichoplusia Ni ◽

Insect Parasite ◽

Nitrogen Elimination

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Effects of parasitization by the insect parasite Hyposoter exiguae on the growth, development and physiology of its host Trichoplusia ni

Parasitology ◽

10.1017/s0031182000052793 ◽

1982 ◽

Vol 84 (3) ◽

pp. 491-510 ◽

Cited By ~ 42

Author(s):

S. N. Thompson

Keyword(s):

Growth Rate ◽

Weight Gain ◽

Growth And Development ◽

Trichoplusia Ni ◽

Fat Body ◽

Weight Ratio ◽

Juvenile Hormone Esterase ◽

Insect Parasite ◽

Wet Weight ◽

Growth Development

SummaryThe weight gain and growth rate of Trichoplusia ni larvae were severely depressed following parasitization by the insect parasite, Hyposoter exiguae. The development of the host was also delayed and juvenile hormone esterase activity present at the normal time of moulting was absent in parasitized insects. Similar effects on growth and development were achieved by rearing host insects on nutrient-deficient media. Accompanying the above effects of parasitization were alterations in dry/wet weight ratio and host haemolymph osmolality. Parasitization resulted in immediate increases in the concentrations of haemolymph non-glycogen carbohydrate (composed of trehalose, maltose and glucose) and protein. The concentration of fat body glycogen also increased following parasitization. In contrast, the concentration of haemolymph non-glycogen carbohydrate and protein, as well as fat body glycogen, decreased in nutrient-deprived larvae. The significance of the above results as they relate to the insect parasite–host relationship is discussed.

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