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Você sabia que as joaninhas são extremamente importantes no controlo biológico de pragas? 2s1a1p

As cores brilhantes destes insectos desencorajam o ataque por parte dos predadores. l171i

16/10/2024 10h09 - Atualizado em 16/10/2024 às 10h09
Você sabia que as joaninhas são extremamente importantes no controlo biológico de pragas?
Karla Neto
As joaninhas são extremamente importantes no controlo biológico de pragas, já que tanto as larvas como os adultos são predadores vorazes de afídeos. As cores brilhantes destes insectos desencorajam o ataque por parte dos predadores.

O tempo de vida de uma joaninha varia entre 3 até cerca de 9 meses.
Em primeiro lugar, a curiosidade sobre as joaninhas refere-se aos besouros coleópteros da família Coccinellidae. No geral, são espécies de corpo redondo e colorido, com cores diferentes. Ademais, são predadoras de pragas agrícolas com grande importância na agricultura, porque atuam no controle biológico.

Comumente, as joaninhas estão nos jardins ao redor do mundo inteiro. Ademais, costumam ser insetos úteis porque se alimentam de pragas agrícolas como pulgões, afídeos, moscas-das-frutas, piolhos da folha e afins. Mais ainda, podem comer até 5 mil pulgões durante toda a vida. Entretanto, caso falta alimento, elas praticam o canibalismo.

A princípio, as cores servem como advertência para afastar as pragas, pois são suas predadoras. Além disso, os principais predadores das joaninhas são os pássaros, rãs, vespas, aranhas e libélulas. Desse modo, suas cores também atuam como aviso aos predadores, com a intenção de enganá-los e se proteger. Entretanto, não são tóxicas para o ser humano.

Porém, estima-se que algumas espécies de joaninhas podem ser identificadas pelo número de pintas. Apesar disso, a mais comum é a de 7 pintas da espécie Coccinella septempunctata. Contudo, é comum que as pintas desapareçam enquanto elas envelhecem e compreende-se que essas pintas não indicam idade ou algo assim.

Em cada ciclo reprodutivo, a fêmea pode colocar de 10 a mais de 1.000 ovos. Antes da postura, a joaninha procura um local adequado para a eclosão dos ovos, depositando-os geralmente de forma agrupada, sobre folhas ou caules de plantas, e próximos a fontes de alimento. Os ovos de joaninha são amarelos brilhantes. As fêmeas põem ovos em massas de cerca de 5 a 50, nas folhas.

Agora que você já sabe um pouco mais sobre a importância da joaninha, sempre que a avistar em seu jardim tenha a certeza de que ela está por ali contribuindo diretamente para regular o ambiente e manter o equilíbrio entre as espécies cultivadas. 

 No entanto, ainda assim, é fundamental estar atento a plantação e exercer uma rotina de manutenção com cuidados básicos para o bom desenvolvimento das plantas como: rega contínua, podas eventuais e cuidado constante com galhos e plantas secas que possam obstruir o solo e gerar fungos. 

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