Survey and population dynamic of spiders infesting faba bean, with emphasis on acaricide effect on biological aspects of the spider Kochiura aulica (Araneae: Theridiidae)‎

Abstract EN

Spiders are beneficial predators and ancient animals.

They are abundant and widespread in all ecosystems and constitute one of the most important components of global biodiversity.

They are voracious predators and combined with their high abundance, may play an important role in the reduction of different pests populations.

Spiders are among the most abundant predators recorded in faba bean (Vicia faba Harz) in Beni-Suef Governorate.

Field trials were conducted in Beni-Suef Governorate during 2017 and 2018 to survey and population dynamic of some families and species of the spiders.

Results indicated that recorded predaceous spiders were identified in 6 families as follows: Uloboridae (orb-weavers), Theridiidae (mostly space web weavers), Salticidae (jumping spiders), Thomisidae, Philodromidae (crab spiders) and Cheiracanthiidae.

The high percentage mortality appeared in different species spider treated with recommend of Wonder 36%SC resulted after 7 days from treatment averaged 32.8 and 38.7% mortality for Thomisus spinifer, 30 & 60% mortality of Theridion melanostictum, followed by Theridion spinitarse (26.6 & 39.7%) mortality for female and male, respectively compared with (0.0%) in control.

The effect of acaricide on the biological aspects of Kochiura aulica (Koch) (Araneae: Theridiidae) was studied under laboratory condition.

The first and 2nd instar spiderling females and males were high affected when treated with recommended compound, the both instars filled to complet the duration.

Whereas, high significantly prolonged the duration of the 3rd, 4th and 5th spiderlings female than untreated.

The compound increased the duration female by 16.3 days on contrast decreased the duration male by 5.7 days compared with control.

Female resulted from treated 3rd instar spiderlings deposited 17.0 eggs/ sac, compared with 26.6 eggs/ sac in control.

The hatching percentages were 65.0 %, when female resulted from treated, compared with 96.0 in control.

The results also revealed that Wonder was the most effective acaricide on duration, fecundity and hatching.