Effects of precocene II on morphogenesis of the desert locust Schistocerca gregaria

Effects of azadirachtin on mortality rate and reproductive system of the grasshopper Heteracris littoralis Ramb. (Orthoptera: Acrididae)

“…Feyereisen and Tobe (1981) showed that oogenesis and vitellogenesis are inhibited by other JH analogues such as precocene in many insects. Eid et al (1988) showed that ovaries of the female S. gregaria treated with precocene did not exhibit the vitellogenic stage, while in the normal females vitellogenesis started earlier. Ahi (1988) used another JH mimic (aldrin) on Poekilocerus pictus and mentioned abnormal fragmentation of oocytes with degeneration of the follicular epithelial cells.…”

Isolation of Insecticidal Constituents from the Essential Oil ofAgeratum houstonianumMill. againstLiposcelis bostrychophilaBadonnel

“…In the previous studies, precocene II and precocene I demonstrated to inhibit the synthesis of juvenile hormone in a number of insects. Consequently, this inhibition can disturb the embryonic development, induce premature metamorphosis, decrease the reproductive potential, and affect the insect behavior including the antifeedant and repellent effect [19,[30][31][32][33][34][35]. The above findings suggest that the essential oil and the two isolated constituent compounds show a potential to be developed as possible natural insecticides/repellents for the control of grain storage insects.…”

Existing potentials in Insect Growth Regulators (IGR) for crop pest control

“…While Seth et al Among antagonistic activities, the ecdysteroid antagonist cucurbitacin B caused fertility suppression in parental generation of A. gossypii and generated effects that influenced his F1 generation (Yousaf, et al, 2018). JH antagonists can stimulate fertility and eggs maturation, and these data are possible to be visualized in treatments of precocene I in Myzus persicae (Sulzer, 1776) (Hemiptera: Aphididae), known as green peach aphid (Ayyanath, et al, 2015); and in precocene II treatments in S. gregaria (Eid, et al, 1988). On the other hand, Amiri et al (2010) demonstrated the effects of reduction in laying and hatching eggs of E. integriceps insects submitted to precocene I.…”

“…Precocene II treatment in S. littoralis caused the elongation of treated larvae, and deformations in pupae and adults (Khafagi & Hegazi, 1999). Other alteration activities proposed by precocenes are modifications in the sensory system due to a reduction in the number of sensillae and disturbances in antennae development (Triseleva, 2003), and changes in pigmentation of treated insects (Pedersen, 1978;Eid, et al, 1988).…”

“…The stimulation of molting and early metamorphosis is one of the activities already characteristic of precocenes, and its effectiveness is proven in the presence of early adults of L. migratoria, S. gregaria, M. persicae, A. pisum and A. fabae (Pedersen, 1978;Chenevert, et al, 1980;Hales & Mittler, 1981;Hardie, 1986;Eid, et al, 1988); and in early nymphs of Nilaparvata lugens (Stal, 1854) (Hemiptera: Delphacidae), the brown planthopper (Bertuso, et al, 2002).…”