“Sustainable development is the development that meets the needs of the present without compromising the ability of future generations to meet their own needs”- WCED, 1987.

About three quarters of terrestrial animals and plants make their homes in forests, while approximately one-quarter of the global people—depend on forest resources for their sustainment.  Sustainable forest affirms forest resources to expedient the needs of all succeeding generations. Nonetheless, forest insect pests and diseases are big threats to global forest sustainability in the twenty-first century. On the other hand, forest insects perform in vital roles in plant reproduction, biomonitoring, soil fertility, sustained forest health, food and shelter sources for other organisms and advantages to forest adjacent people as well.

Insects are central players in most of the major biomes of the world. Among 1,635,250 existing recorded species about eighty percent of the mentioned species.

Detrimental effects of forest insects1. Direct damage (viz. defoliating, gall makers, leaf-mining, sucking, boring)  by feeding on plants in the field or by infesting stored products, 2. Indirect damage by spreading viral diseases of plants, 3. Spreading disease among humans and livestock and 4. Annoyance to humans and livestock (viz. Biting/stinging).

Beneficial Effects of forest insects: 1. Plant pollination - Around 80 percent of all trees and bushes are pollinated by insects such as bees, wasps, flies and beetles.

2. Plant protection- Parasitoids, predators (Biocontrol agents)
3. Nutrient recycling - by detritus and dung feeders.
4. Bioindicator.
 5. In improving soil fertility through waste bioconversion
6. Human food - over 500 species of insects are used as food by humans -usually crickets, grasshoppers, beetle and moth larvae and termites.
7. Environmental: Insects promoted as food emit considerably fewer greenhouse gases (GHGs) than most livestock (methane, for instance, is produced by only a few insect groups, such as termites and cockroaches).
8. Climate change: Disruption of forest insects are consequences of the loss of carbon sinks and have feedbacks on climate change, with severe results for biodiversity and ecosystem function.
9. Livelihoods (economic and social factors) Production of products - honey, beeswax and royal jelly, silk (produced by the caterpillar, Bombyx mori), shellack (a varnish produced by a plant bug), cochineal (red food colouring produced by a plant bug), and mass rearing economic insect.
10. Miscellaneous - Indigenous peoples often used butterflies and brightly coloured beetles as head or body decoration. Insect collecting is a common Western hobby and there is a small industry in arthropod pets.

Insects help the forest adjacent people: a. As food, b. As a medicine, c. Pest control in both agricultural and horticultural, d. Save life from vector-borne diseases, e. As farming of fish, poultry, apiculture, lac culture and sericulture, f. Pollinators services and g. Protecting the environment and pesticide-free vegetables and fruits.
In Bangladesh, forest covers about 17.5% of the total land area of the country (www.arannayk.org), and the high and rapidly a growing population of Bangladesh places a great strain on the natural resources.

Present status of forest entomology in Bangladesh: i. Most species are undescribed.
ii. The abundance of species and their changes in space and time are unknown.
iii. Species ways of life and sensitivities to habitat change are largely unknown.
iv. Despite their high diversity and importance for humankind, forest insects (FIs) are often neglected in biodiversity conservation.
v. FIs and their ecological services are mostly unknown to the general public.
vi. Policymakers and stakeholders are mostly unaware of FIs conservation problems.
vii. No proper documentation about dynamic and complex relationships among native plant species, insects and exotic plants or/and insect species.
viii. No existing data for exotic insects and they are accused of one of the biggest threats to native forest ecosystems. 
ix. No specific study was found in forest insects and climate change.
x. No integrated work was documented on “Forest insects -Forest sustainability -Socio-economy”

Advanced forestry policy should be planned and implemented for remaining sustainable in our forest.

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