Insect growth inhibitory activity

Table I. Insect growth inhibitory activity (EDcq natural...

Insect Growth-Inhibitory Activity of Some Meliaceae and Rutaceae Limonoids. Values are the Dietary Concentrations for 50% Growth Inhibition (EC50)... 

In fact, abyssinol A (II), B (III) and C (IV), isolated monitoring by the leaf disk assay> did not show any Insect growth inhibitory activity, as is shown in Table III. 

Table V. Insect growth Inhibitory activity of some Mellaceae and...

Table I shows the growth inhibitory activity of the four synthetic isobutylamides on the four lepidopterous larvae. The activity of the synthetic cis isomer (7) of fagaramide (J ) was 2- to 4-fold greater, depending on the insect species tested, than was fagaramide itself. Bioassay of synthetic amides identi-...

Although the biological activity of brevifolin as an insect growth inhibitor is unknown, gallic acid exhibited some growth-inhibitory activity against virescens larvae (EC50 = 7.40 mmol/kg diet)... 

Acetylnimbandiol was insectidical (EI50 = 21 ppm) when fed to the larvae of II. vlrescens, while the structurally related salannin, which lacks the A-ring ketone (Figure 13), was not (Table VII) (57). Nakanishi (58) has pointed out that natural products with electrophilic moieties tend to be cytotoxic and insect antifeedant. Possibly the growth-Inhibitory activity of the limonoids may also be attributed to a nonspecific electrophilic effect. 

Resveratrol analogs have been extensively studied for their anti-oxidative properties. Some were found to be more active than resveratrol (1). The SARs of some resveratrol analogs have been discussed [388,395,466,497]. Several resveratrol derivatives from Yuccapericulosa F. Baker showed inhibitory activity on bleaching of crocin induced by alkoxyl radicals and scavenging properties toward DPPH. This may later contribute to their insect growth regulatory activities [498]. 

Phenylpropanoids have been known for numerous biological activities such as alleviation of fever, relief, antioxidative activity, growth inhibitory activity for spore of plant, or higher plant, insect attraction activity, and so on. 

Lidert Z, Wing K, Polonsky JJ, Imakura Y, Okano M, Tani S, Lin Y-M, Kiyokawa H, Lee K-H (1987) Insect antifeedant and growth inhibitory activity of forty-six quassinoids on two species of agricultural pests. J Nat Prod 50 442... 

Another natural product which was Isolated from A. indica and found to have potent ecdysis Inhibitory activity Is deacetyl-azadlrachtlnol (Figure 8) (42). The biological activity of deacetylazadlrachtlnol fed in artificial diet to H. virescens Is shown In Table IV. Although deacetylazadlrachtlnol was about 2.5-fold less active than was azadlrachtln as an Insect growth Inhibitor (EC50 - 0.17 and 0.07 ppm, respectively), the two compounds had the same ecdysis inhibitory activity (EI50 "... 

Various biological activities, such as antibacterial and antitumor ones, and inhibitory activities as to insect growth and oxidative phosphorylation in rat mitochondria, are known for Rabdosia diterpenoids [2]. During the past decade, the antitumor activity of diterpenoids isolated from R. trichocarpa [149. 150]... 

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